Question

Henry was thinking of a number. Henry divides by 2, then adds 10 to get an answer of 15. What was the original number?

Answer 1

Henry was thinking of the number 10.

Explanation:

Variable x = Henry's original number

Set up an equation:

x ÷ 2 + 10 = 15

Isolate variable x:

x ÷ 2 = 5

x = 10

Answer 2

10 bc 10 divided by 2 is 5 then 5 plus 10 = 15