Question

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

Answer 1

I hope this will guide you......
let the number be n ... 

then,according to question .... 
n + n/2 = 72 

(2n+n)/2 = 72 

3n = 72 X 2 = 144 

n = 144/3 = 48
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Answer 2

no. = x + x /2
(2x + x) /2
3x/2
ATQ
72=3x/2
(72×2) =3x
144/3=x
48=x