A jar contains only red and blue marbles in a ratio of 3:6. If there are 42 blue marbles, how many red marbles are there?
Difficulty: Medium
About this MCQ
Medium GRE item. Correct choice: A. 21.
- A. 21 ✓
- B. 63
Why not B: “63” is not 21.
- C. 42
Why not C: “42” is not 21.
- D. 24
Why not D: “24” is not 21.
Correct answer
A. 21
Explanation
21 (option A) is the accepted answer to “A jar contains only red and blue marbles in a ratio of 3:6. If there are 42 blue marbles, how many red marbles are there”. Option B (63) is a different value from 21. Option C (42) is a different value from 21. Option D (24) is a different value from 21. Keep 21 as the GRE fact for this stem.
Source: Original practice question, MCQsHub
Tags: Math, American Exams, GRE, Ratios
Submitted by: MCQsHub Editorial
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