Question

Find a number which when multiplied by 5 is increased by 80.

Answer 1

Let the required number be x.
According to the question:
or, 5x = x + 80
or, 5x − x = 80 [Transposing x to the L.H.S.]
or, 4x = 80
or, `(4x)/4=80/4` [Dividing both the sides by 4]
or, x = 20
Thus, the required number is 20.