Question

A number when added to it's half gives 72. Find the number.

Answer 1

if number is x
then its half is x/2

then 
x + x/2 = 72
(2x +x)/2 =72
3x= 144
x = 48
therefore the no is 48

Answer 2

Let the no be x
x + x/2 = 72
3x/2 = 72
x = 72*2/3 = 48
x = 48