Peter doubles it, then adds 5 to get an answer of 23.6. What was the original number?

x = 9.3

Step-by-step explanation:

set it up as a equation, when the word problem says "it" it is referring to x. "Peter doubles it", so double x.

2x

then the text says "then adds five", so add five.

2x + 5

then says the answer is 23.6

2x + 5 = 23.6

solve for x