Which of the following number pairs is in the ratio 4:5?

Which of the following number pairs is in the ratio 4:5?
A . 1/4, 1/5
B . 1/5, 1/4
C . 1/5, 4/5
D . 4/5, 5/4
E . 1, 4/5

Answer: B

Explanation:

Two numbers are in the ratio 4:5 if the second number is 5/4 times the value of the first number; 1/4 is 5/4 times the value of 1/5.

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