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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 30,805

Hi,

#7666. The average weight of 3 group of friends of 50, 30, and 20 members respectively are 50 kilograms, 52 kilograms, and 55 kilograms. What is the average weight of all the friends taken together?

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**Monox D. I-Fly****Member**- From: Indonesia
- Registered: 2015-12-02
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Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away.

May his adventurous soul rest in peace at heaven.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 30,805

Hi,

Neat work!

#7667. The average of the age of A, B, and C is 25 years, while the average of the age of A, B, and D is 28 years. If D is 28 years old, then what is the age of C?

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 30,805

Hi,

#7668. The average age of all employees of M/s XYZ is 35 years. It was later found that age of one of the employees has been taken as 10 years less than his actual age, so the new average after correction increased by 0.5 years. Find the number of employees of M/s XYZ.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 30,805

Hi,

#7669. The average of p, q, 13, and 21 is 16 and average of q, 5, 12, and 17 is 10. Find the value of pq.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**Monox D. I-Fly****Member**- From: Indonesia
- Registered: 2015-12-02
- Posts: 2,000

Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away.

May his adventurous soul rest in peace at heaven.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 30,805

Hi,

The solution is correct. Excellent!

#7670. The average height of a group of 12 boys increases by 2 inches when a boy of 52 inches is replaced by another boy. What is the height of the new boy?

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 30,805

Hi,

#7671. On an average, Michael scored 85 marks in French, English, Mathematics, and Physics. If the marks of Chemistry are included, the average becomes 80. How much did Michael score in Chemistry?

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**Monox D. I-Fly****Member**- From: Indonesia
- Registered: 2015-12-02
- Posts: 2,000

Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away.

May his adventurous soul rest in peace at heaven.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 30,805

Hi,

The solution #7671 is correct. Neat work!

#7672. The average of 6 numbers is 10. If each of these number is divided by 2 and then 1 is subtracted from each of these resultant numbers, then find the new average.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**Monox D. I-Fly****Member**- From: Indonesia
- Registered: 2015-12-02
- Posts: 2,000

May his adventurous soul rest in peace at heaven.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 30,805

Hi,

Good work!

#7673. Find the difference between the average of first 52 even numbers and first 49 odd numbers.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 30,805

Hi,

#7674. The average of a family of 6 members, 3 years ago, was 28 years. Meanwhile, a child was born in the family and the average age of the family members is 27 years today. What would be the age of the child so born, 2 years from now?

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 30,805

Hi,

#7675. Neil traveled a distance of 50 kilometers at the speed of 10 kilometers per hour, next 60 kilometers at the speed of 15 kilometers per hour, and remaining 40 kilometers at the speed of 20 kilometers per hour. Find the average speed of Neil for the entire journey.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 30,805

Hi,

#7676. Find the average of 5 consecutive even numbers, if the smallest of those numbers is denoted by x.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**Monox D. I-Fly****Member**- From: Indonesia
- Registered: 2015-12-02
- Posts: 2,000

May his adventurous soul rest in peace at heaven.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 30,805

Hi,

Good work!

#7677. The average of 2 prime numbers lying between 20 and 40 is 30. find the product of the 2 prime numbers.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**Monox D. I-Fly****Member**- From: Indonesia
- Registered: 2015-12-02
- Posts: 2,000

May his adventurous soul rest in peace at heaven.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 30,805

Hi,

Good attempt!

#7678. Six tables and twelve chairs were bought for $7,800. If the average price of a table is $750, then find the average price of a chair.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**Monox D. I-Fly****Member**- From: Indonesia
- Registered: 2015-12-02
- Posts: 2,000

May his adventurous soul rest in peace at heaven.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 30,805

Hi,

Neat work!

#7679. The average of 8 numbers is 27. If each of the numbers is multiplied by 8, find the average of new set of numbers.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**Monox D. I-Fly****Member**- From: Indonesia
- Registered: 2015-12-02
- Posts: 2,000

May his adventurous soul rest in peace at heaven.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 30,805

Hi,

Good attempt!

#7680. Out of four numbers, the average of the first three is 15 and that of the last three is 16. If the last number is 19, find the first.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**Monox D. I-Fly****Member**- From: Indonesia
- Registered: 2015-12-02
- Posts: 2,000

May his adventurous soul rest in peace at heaven.

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 30,805

Hi,

Neat work!

#7681. The average of nine numbers is 50. The average of the first five numbers is 54 and that of the last three numbers is 52. Find the sixth number.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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