Question

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?

Answer 1

Alright, lets get started.

Jim was thinking of a number.

Suppose the number Jim was thinking, is x.

Jim adds 20 to it means number will be =
`x+20`

And Jim doubles it, means
`2*(x+20)`

Jim gets 99.2 and as per us, he gets
`2*(x+20)`

So, making them equal

`2(x+20)=99.2`

`2x+40=99.2`

Subtracting 40 in both sides

`2x+40-40=99.2-40`

`2x=59.2`

`x=29.6`

It means the original number is 29.6. : Answer

Hope it will help :)