Jim was thinking of a number. Jim adds 20 to it, then doubles it and gets an answer of 99.2. What wa

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Jim was thinking of a number. Jim adds 20 to it, then doubles it and gets an answer of 99.2. What was the original number?

Start with x.

Add 20 to it
x + 20

Double it
2(x + 20)

Set this equal to 99.2
2(x + 20) = 99.2

Divide each side by 2:
x + 20 = 49.6

Subtract 20 from each side:
x = 29.6