A jar contains only red and blue marbles in a ratio of 3:9. If there are 54 blue marbles, how many red marbles are there?
Difficulty: Medium
About this MCQ
Medium ACT item. Correct choice: D. 18.
- A. 21
Why not A: “21” is not 18.
- B. 72
Why not B: “72” is not 18.
- C. 54
Why not C: “54” is not 18.
- D. 18 ✓
Correct answer
D. 18
Explanation
18 (option D) is the accepted answer to “A jar contains only red and blue marbles in a ratio of 3:9. If there are 54 blue marbles, how many red marbles are there”. Option A (21) is a different value from 18. Option B (72) is a different value from 18. Option C (54) is a different value from 18. Keep 18 as the ACT fact for this stem.
Source: Original practice question, MCQsHub
Tags: Math, American Exams, ACT, Ratios
Submitted by: MCQsHub Editorial
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