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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 674

Hi::

Read ratio topic in mif https://www.mathsisfun.com/numbers/ratio.html

Don't understand how to write in fraction There are 3 blue squares to 1 yellow square

It is given 3:1 but in fraction it say numerator And denominator numerator is part we have and denominor is the whole is divided into

Explain this??

MZk

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**bob bundy****Administrator**- Registered: 2010-06-20
- Posts: 8,371

Zeeshan 01 wrote:

denomin

ator is the whole

The whole has 4 squares.

Zeeshan 01 wrote:

numerator is part we have

If you want the blue fraction that is 3 squares so blue fraction is 3/4

If you want the yellow fraction that is 1 square so yellow is 1/4

Bob

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 674

So what is 3÷1

MZk

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**Monox D. I-Fly****Member**- From: Indonesia
- Registered: 2015-12-02
- Posts: 1,239

It shows that there are 3 blue squares for each 1 yellow square

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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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 674

I don't think it says this

MZk

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**bob bundy****Administrator**- Registered: 2010-06-20
- Posts: 8,371

Zeeshan 01 wrote:

So what is 3÷1

This reads as 'three divided by one' Did you mean that, or did you intend to type 3:1 ?

Bob

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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**iamaditya****Member**- From: Planet Mars
- Registered: 2016-11-15
- Posts: 766

I don't think it says this

Yes, it says that only.

Practice makes a man perfect.

There is no substitute to hard work

All of us do not have equal talents but everybody has equal oppurtunities to build their talents.-APJ Abdul Kalam

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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 674

3:1 and 3÷1 are not same things>>>

*Last edited by Zeeshan 01 (2017-07-27 00:10:13)*

MZk

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**bob bundy****Administrator**- Registered: 2010-06-20
- Posts: 8,371

Sorry, Zeeshan 01, but what I'm seeing are not the same.

I'm seeing a divide symbol and a colon. A colon is commonly used to indicate a ratio. Ratio and division(fraction) are not the same, although they are closely and simply connected.

Bob

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 674

there is no compound proportion topic to express how to treat different information how to reverse order and other things

>>>

*Last edited by Zeeshan 01 (2017-07-27 00:08:20)*

MZk

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**bob bundy****Administrator**- Registered: 2010-06-20
- Posts: 8,371

hi Zeeshan 01

You were asking about ratio and fractions and now you have jumped to compound proportion.

May I assume you are ok now with ratio and fractions?

Before you jump to compound proportion, are you ok with simple proportion, both direct and inverse?

Easier if you have an example.

Bob

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 674

No I am not asking about fraction only ratio and proportion topics

MZk

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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 674

Yes ok with those two!!!!!

MZk

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**bob bundy****Administrator**- Registered: 2010-06-20
- Posts: 8,371

I had a look at other on-line sites for compound proportion. There are formulas but I wouldn't recommend trying to learn and use them. Compound proportion means a series of simple proportion steps, so you can always do a problem by considering each step separately. Here's a example to show what I mean:

example. A fence company employs people to dig the post holes. There are three variables:

How many people to dig the holes.

How much time they will take.

How many holes are needed.

If the number of holes is fixed, then more people means less time to dig, so that is inverse proportion.

If the number of people is fixed, then more holes will take more time, so that is direct proportion.

If the amount of time available if fixed, then more people means more holes, so that is direct proportion.

Suppose we known that 10 people can dig 18 holes in 5 hours.

How long will it take for 15 people, to dig 12 holes ?

Let's keep the number of holes fixed first. How long will 15 people take to dig 18 holes?

Holes fixed is inverse proportion. The number of people has gone up from 10 to 15, ie times 15/10, so the time will go down by times 10/15

New time = 5 x 10/15 = 10/3 hours.

Now we'll keep the number of people fixed. How long will 15 people take to dig 12 holes ?

People fixed is direct proportion. The number of holes has gone from 18 to 12 ie. times 12/18, so the time will go down by times 12/18

New time = 10/3 x 12/18 = 10/3 x 2/3 = 20/9 hours.

Hope that helps.

If you really want the formulas, 'google' compound proportion and you'll find lots of sites.

Bob

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 674

bob wrote:

I had a look at other on-line sites for compound proportion..

Do you don't know this

MZk

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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 674

but my question is why we reverse order in inverse proportion can you show me with example

MZk

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Here is a nice example: http://www.bbc.co.uk/schools/gcsebitesi … rev2.shtml

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