Free Practice Question
PS · Problem Solving
sub-505
Percentages
If 120% of a is equal to 80% of b, which of the following is equal to a+b?
Answer Choices
Correct answer marked belowA
1.5a
B
2a
2.5a
Correct
D
3a
E
5a
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Explanation
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What it tests
Your ability to compute percentage change, percentage of a whole, and to work backwards from a final value.
Common trap
Treating successive percentage changes as additive — a 10% rise then a 10% fall is not back to the start.
Details
Difficulty
sub-505
Type
PS
Category