Question

Fifteen times a number subtracted from 80 is 25

Answer 1

Let the number be x.

15 times the number = 15x

This  is subtracted from 80,    80 - 15x

80 - 15x = 25

-15x = 25 - 80

-15x = -55

x = -55 / -15

x = 11/3

So the number is 11 / 3.