Set 5: Ratios Rates Proportions (Beginner)

**Choice A is the best answer.** Cross multiply: 4x = 4 times 20 = 80. x = 20

Explanation

Answer: A

PROBLEM

Solve: 4/4 = 20/x. Find x.

✓ Correct

Detailed Explanation

Choice A is the best answer. Cross multiply: 4x = 4 times 20 = 80. x = 20

Why others are wrong:

B: 19 is incorrect because it does not satisfy the equation.

C: 21 is incorrect because it does not satisfy the equation.

D: 22 is incorrect because it does not satisfy the equation.