What happens to the value of d?

If

and a and c are doubled, what happens to the value of d?
A. The value of d remains the same.
B. The value of d is doubled.
C. The value of d is four times greater.
D. The value of d is halved.
E. The value of d is four times smaller.

Correct Answer: A
Explanation/Reference: Explanation:
If a and c are doubled, the fraction on the left side of the equation becomes

. The fraction has been multiplied by 2/2 which is equal to 1. Multiplying a fraction by 1 does not change its value:


.
The value of d remains the same.

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