#4773. The average of 30 numbers is 40 and that of the other 40 numbers is 30. Find the average of all the numbers.

]]>#4772. The angles of a triangle are in Arithmetic Progression and the greatest angle is double the least. What is the ratio of the angles in the radian measure?

]]>#4771. Ralph obtained 36, 25, 34, and 25 marks in history, geography, biology, and physics. What are his average marks?

]]>#4770. The average of four consecutive odd numbers is 6. Find the smallest of these numbers.

]]>#4769. The average of 50 numbers is 38. If two numbers viz. 45 and 55 are discarded, find the average of the remaining numbers.

]]>#4768. Find the least value of n for which the sum of the series 3 + 7 + 11 + 15 + 19 + ... is greater than 820.

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#4767. Find the number of terms in the series 15 + 13 + 11 + 9 + 7 + 5+ ...... such that the sum is 63. If there are two solutions, give both.

]]>#4766. How many natural numbers between 100 and 400 are there which are multiples of 9?

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#4765. Find the least value of n for which the sum of the series 5 + 8 + 11 + ... up to n terms is not less than 670.

(a) 20

(b) 21

(c) 22

(d) 23.

#4764. Robert receives $600 in the first week and $30 more each week than the preceding. What is the total amount he has received by the end of the 20th week?

]]>#4763. Robert receives $600 in the first week and $30 more each week than the preceding. What does he get in the 20th week?

]]>#4762. A sum of money kept in a savings bank account amount to $1240 in 4 years and $1600 in 10 years. Find the sum (simple interest).

]]>#4761. A number 27 is divided into three parts which are in Arithmetic Progression and the sum of their squares is 261. Find the smallest one.

]]>#4760. Find the value of 50 terms of

.]]>#4759. Find the value of the expression 1 - 6 + 3 - 10 + 5 - 14 + 7 - 18 + .... up to 100 terms.

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