Percent change and area: ACT Math Practice Question

Try the following ACT math practice question that tests your understanding of computing percent changes in the context of geometric shapes.

If the length of a rectangle is increased by $20\%$ and the area is unchanged, then the width is decreased by:

1. $\quad 15 \frac{1}{3}\%$
2. $\quad 16 \frac{2}{3}\%$
3. $\quad 18\%$
4. $\quad 20\%$
5. $\quad 25\%$

Choice B

Video Explanation