A jar contains only red and blue marbles in a ratio of 3:9. If there are 63 blue marbles, how many red marbles are there?
Difficulty: Medium
About this MCQ
Medium ACT item. Correct choice: A. 21.
- A. 21 ✓
- B. 84
Why not B: “84” is not 21.
- C. 24
Why not C: “24” is not 21.
- D. 63
Why not D: “63” 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 3:9. If there are 63 blue marbles, how many red marbles are there”. Option B (84) is a different value from 21. Option C (24) is a different value from 21. Option D (63) is a different value from 21. Keep 21 as the ACT fact for this stem.
Source: Original practice question, MCQsHub
Tags: Math, American Exams, ACT, Ratios
Submitted by: MCQsHub Editorial