SAT Math : Whole and Part
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Example Questions
Example Question #6 : How To Find The Whole From The Part With Percentage
On the ride home from school, Jim notices that 
Let x represent the total number of cars Jim sees on the way home. If Jim sees 7 yellow cars and notices that 35% of all the cars he sees are yellow, then we can express this as
7/x = 35%, or
Using cross multiplication, we see that
Therefore, Jim sees 20 total cars on the way home. The question wants to know how many cars are NOT yellow. We can find that by subtracting the total number of cars from the number of yellow cars:
Example Question #41 : Percentage
None of the given answers are correct.
To solve this problem, we can set up a proportion and solve for our missing value using cross multiplication.
Example Question #211 : Arithmetic
Don't let the pi throw you off on this question. We can set up a proportion to solve for the whole that we are looking for.
(Remember that any percentage can also be written as a fraction.)
Now we can solve for our unknown by using cross multiplication.
Therefore, 
Example Question #42 : Percentage
We can set up a proportion to solve this problem. Remember that we can express percentages as fractions.
Now we can cross-multiply and solve for our unknown.
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