Question

Use proportional reasoning to determine the value of a in the proportion shown below.

a=1
a=25
a=10
a=15

Answer 1

Answer: a = 10

Explanation:

3/5 = a + 5/25

Multiply both sides by 25 to get rid of it:

3/5 * 25 = 25(a + 5) /25

15 = a + 5

a = 15 - 5

a = 10