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9

Set 4: Ratios Rates Proportions (Beginner)

Explanation

Answer: A

PROBLEM

If x:y = 5:3 and x = 30, find y.

If x:y = 5:3 and x = 30, find y.

A.

18

✓ Correct
B.

21

C.

20

D.

36

Detailed Explanation

Choice A is the best answer. x/y = 5/3. 30/y = 5/3. y = 30 times 3/5 = 18

Why others are wrong:
B: 21 is incorrect because it does not satisfy the equation.
C: 20 is incorrect because it does not satisfy the equation.
D: 36 is incorrect because it does not satisfy the equation.
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