Question

Which of the following contains a variable?

A. The mass is 95 kilograms.

B. Sally ran twice as fast as Sue.

C. They drove 49 miles per hour.

D. She has 5 sisters.

Answer 1

B

Explanation:

We do not know how fast Sally or Sue is.

If Sally ran at a speed of x, and Sue at a speed of y, we have an equation as follows:

x = 2y