A jar contains only red and blue marbles in a ratio of 5:7. If there are 42 blue marbles, how many red marbles are there?
Difficulty: Medium
About this MCQ
Medium ACT item. Correct choice: C. 30.
- A. 72
Why not A: “72” is not 30.
- B. 42
Why not B: “42” is not 30.
- C. 30 ✓
- D. 35
Why not D: “35” is not 30.
Correct answer
C. 30
Explanation
30 (option C) is the accepted answer to “A jar contains only red and blue marbles in a ratio of 5:7. If there are 42 blue marbles, how many red marbles are there”. Option A (72) is a different value from 30. Option B (42) is a different value from 30. Option D (35) is a different value from 30. Keep 30 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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