A jar contains only red and blue marbles in a ratio of 7:3. If there are 21 blue marbles, how many red marbles are there?
Difficulty: Medium
About this MCQ
Medium GRE item. Correct choice: C. 49.
- A. 70
Why not A: “70” is not 49.
- B. 21
Why not B: “21” is not 49.
- C. 49 ✓
- D. 56
Why not D: “56” is not 49.
Correct answer
C. 49
Explanation
49 (option C) is the accepted answer to “A jar contains only red and blue marbles in a ratio of 7:3. If there are 21 blue marbles, how many red marbles are there”. Option A (70) is a different value from 49. Option B (21) is a different value from 49. Option D (56) is a different value from 49. Keep 49 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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