GRE General TestQuantitative ReasoningEasy
A quality control technician inspects a batch of 800 electronic components. If 3 out of every 50 components are found to be defective, how many defective components are in the entire batch?
- A60
- B54
- C36
- D48
Show answer & explanationAnswer & explanation
Correct answer: D. 48
To find the number of defective components, first determine the defect rate as a fraction. Then, multiply this fraction by the total number of components in the batch.
Why the other options are wrong
- A. This calculation is incorrect, possibly by using an inverse ratio or incorrect total.
- B. This calculation is incorrect, likely due to a multiplication error or misapplication of the ratio.
- C. This calculation is incorrect, possibly by misinterpreting the ratio.
Ratio Application
Applying a given ratio to a total quantity to find the proportional amount of one part of the ratio.
- Ratios express the relationship between two or more quantities.
- They can be written as fractions, with a colon, or with the word 'to'.
- To apply a ratio, set up a proportion or multiply the ratio fraction by the total.
Memory trick: Ratio's Rate, Total's Fate: Multiply to get the correct count.