A jar contains only red and blue marbles in a ratio of 7:4. If there are 12 blue marbles, how many red marbles are there?
Difficulty: Medium
About this MCQ
Medium GMAT item. Correct choice: B. 21.
- A. 28
Why not A: “28” is not 21.
- B. 21 ✓
- C. 33
Why not C: “33” is not 21.
- D. 12
Why not D: “12” is not 21.
Correct answer
B. 21
Explanation
21 (option B) is the accepted answer to “A jar contains only red and blue marbles in a ratio of 7:4. If there are 12 blue marbles, how many red marbles are there”. Option A (28) is a different value from 21. Option C (33) is a different value from 21. Option D (12) is a different value from 21. Keep 21 as the GMAT fact for this stem.
Source: Original practice question, MCQsHub
Tags: Math, American Exams, Ratios, GMAT
Submitted by: MCQsHub Editorial
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