SAT Math : How to find percentage
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Example Questions
Example Question #11 : How To Find Percentage
What number is 30% of 90?
Verbal cues include "is" and "of." "Is" means equals and "of" means multiplication.
So the equation to solve becomes
Example Question #12 : How To Find Percentage
If the length of a rectangle is increased by 50% and with width of the same rectangle is decreased by 50%, what is the effect on the area of the rectangle?
It is decreased by 50%
It is increased by 25%
It is unchanged
It is increased by 50%
It is decreaed by 25%
It is decreaed by 25%
This is a good question to use random numbers. Lets use 100 and 10 as the lengths. That means the area = 100 x 10 = 1000
If we increase the length of the side measuring 100 by 50% = 150
If we decrease the length of the other side 50% = 5
Area = 150 x 5 = 750
We see that the area decreased by 250 or 25% decrease in area!
Example Question #13 : How To Find Percentage
If 80 percent of x is 200, what is 60 percent x?
175
250
200
225
150
150
Example Question #14 : How To Find Percentage
Seventeen percent of some number is 34. What is this number?
None of the available answers
The algebraic expression is:
Example Question #15 : How To Find Percentage
What number is 125% of 60?
90
75
66
60
80
75
Translate this into a mathematical equation:
x = 1.25 * 60
x = 75
Example Question #16 : Other Percentage
If 10% of 
Find 25% of 
10% of 
Divide both sides by 0.1 to find that 
Example Question #31 : Percents
There are 
What percent of students did not vote?
The number of students who did not vote is:
The percent of students who did not vote is therefore:
Example Question #111 : Percentage
Joaquin is running for Prom King. If he receives 
First, we find how many seniors voted for him:
0.30 * 200 = 60 seniors
Then we find how many juniors using the same method
0.60 * 250 = 150 Juniors
Finally, we add the two together
60 + 150 = 210 students total
Example Question #16 : How To Find Percentage
13 is what percent of 25?
To solve this problem, we should set up the following proportion
where x is the percentage we are looking for.
To solve, simply cross multiply and solve for x.
Therefore, our answer is 52%.
Example Question #19 : How To Find Percentage
What percent of 
Let's set up a proportion to solve this problem.
We're looking for a percentage, 
Our answer is
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