ISEE Lower Level Math : How to find a ratio
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Example Questions
Example Question #31 : Ratio And Proportion
The scale on a map is 2cm : 12km . If and the actual distance between two lakes is 600 km, find the distance between the lakes as shown on a map.
To solve this problem, set up the proportion:
Cross multiply:
Divide both sides by 12 to isolate x.
Example Question #31 : How To Find A Ratio
You and a friend win a raffle of 
Since there are a total of five shares in the ratio
and you get two shares, your share is 
and
Your share is 
Example Question #31 : How To Find A Ratio
If three friends start a business and two invested equally while the third invested twice the amount each of them did, what is the ratio for their shares?
Since the first two have to be equal, you can start by representing them by 
The third invested twice the amount that each of the others did so you double their share to get 
So the first friend gets one share and so does the second.
The third friend gets two shares and the ratios looks like,
Example Question #34 : How To Find A Ratio
Sharon has 
The ratio of blue marbles to white marbles is 
In simplest form, the ratio is
Example Question #32 : Ratio And Proportion
A fruit punch recipe calls for 1 cup of orange juice, half a cup of pineapple juice, and 2 cups of soda. What is the ratio of orange juice to pineapple juice to soda water?
If a fruit punch recipe calls for 1 cup or orange juice, half a cup of pineapple juice, and 2 cups of soda, the ratio would be:
Multiply all three numbers by 2:
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