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

Henry was thinking of the number 10.

Step-by-step explanation:

Variable x = Henry's original number

Set up an equation:

x ÷ 2 + 10 = 15

Isolate variable x:

x ÷ 2 = 5

x = 10

step-by-step explanation:

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step-by-step explanation: