Question

Sushil was thinking of a number. Sushil doubles it and adds 4.7 to get an answer of 77.8. Form an equation with

x from the information.

Answer 1

Explanation:

All you have to do is do the problem backwards.

For example, if your number is 1 then you add 4, double that, subtract 7, and you will get 3.

All the computer has to do is do the problem backwards.

3+7 (opposite of −7) is 10.

10÷2 (opposite of ×2) is 5.

−4 (opposite of +4) is 1, which was my original number.