Thinking of a number

Jill is thinking of a number.  Twenty less than one fourth of the number is -45.  Find Jill's number.

x = the number
x/4 - 20 = -45 {twenty less than one-fourth of the number is -45}
x/4 = -25 {added 20 to each side}
x = -100 {multiplied each side by 4}

The number is -100,  Jill can think of something else, now.

- Algebra House