Question

if a number is increased by 1/3 of itself the result is 28 find the number

Answer 1

Let the number = x

1/3 of x  =  x/3

According to question

x + x/3 = 28

(3x + x) / 3 = 28

4x / 3 = 28

4x = 28 x 3

4x = 84

x = 84/4

x = 21

So, the number is 21.

U can check it also.

1/3 of 21 = 7

21 + 7 = 28

So, the answer is correct.
 

Answer 2

Let the number be 'x'

1/3x + x = 28
(1x + 3x)/3 = 28
4x/3 = 28
x = 28 x 3/4
x = 21