ISEE Lower Level Math : Ratio and Proportion
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Example Questions
Example Question #531 : Numbers And Operations
On a typical day, twenty percent of the pies that a pie store sells are blueberry pies. If the store sells forty pies on just such a typical day, how many blueberry pies were likely sold?
If store sells 
Given that 
Therefore, 
Example Question #13 : How To Find A Proportion
The ratio of rabbits to guinea pigs to hamsters in a pet store is 3:2:4. If there are 12 rabbits in the pet store, how many hamsters are there?
Given that the ratio of rabbits to guinea pigs to hamsters in a pet store is 
Therefore, we can transform the of rabbits to guinea pigs to hamsters into 
Therefore, there are 16 hamsters.
Example Question #18 : How To Find A Proportion
Reduce the following proportion to its simplest form:
To simplify, you find a common factor for both the numerator and denominator and divide them both by that value.
Both 
This gives us,
Example Question #531 : Numbers And Operations
Rachel and Michael earn the same amount of money per hour. Rachel earns $64.00 for eight hours of work. How long would it take Michael to earn $96.00?
In order to solve this problem, you would set up a direct proportion:
To make the process even simpler, you could first reduce the first fraction in this direct proportion. The fraction was reduced to simplest form by dividing both the numerator and the denominator by 8, the greatest common factor or the GCF.
Divide both sides by the coefficient of x, which is 8:
Example Question #20 : How To Find A Proportion
On a map, one inch is equal to 
The proportion for the problem will be,
You then cross multiple to get
To find 
Therefore
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