GRE General TestQuantitative ReasoningEasy
A quality control engineer is inspecting a batch of 800 electronic components. He finds that 3% of the components are defective. How many components are NOT defective?
- A24
- B800
- C776
- D797
Show answer & explanationAnswer & explanation
Correct answer: C. 776
If 3% are defective, then 97% are not defective. Calculate 97% of 800 to find the number of non-defective components.
Why the other options are wrong
- A. This is the number of defective components, not non-defective.
- B. This is the total number of components, assuming none are defective.
- D. This option is incorrect and does not result from common calculation errors.
Percentage of a Quantity
To find a percentage of a quantity, convert the percentage to a decimal or fraction and multiply it by the quantity.
- Percentage means 'out of one hundred'.
- To convert a percentage to a decimal, divide by 100.
- To find the remaining percentage, subtract the given percentage from 100%.
Memory trick: Good parts always make for happy machines.