Question

if 1/5th of a number decreased by 5 is 16. find the number

Answer 1

Let the number be x.
Given x/5 - 5 = 16
(x-25)/5=16
x-25=16x5
x=80+25=105

Answer 2

Let the number be x

so by the condition given in your question we get equation

x/5 - 5 = 16

x - 25 / 5 = 16

x -25 = 80

x = 80 + 25

x = 105

so the number is 105