Question

How to find answer? The answer is 52.

Answer 1

Let the number be 10x+y

x+y=7        ..........(i)

after reversed the number, 10y+x be new number formed

ATQ,

(10x+y)-(10y+x)=27

10x+y-10y-x=27

9x-9y=27

9(x-y)=27

x-y=3                ............(ii)

add (i) and (ii) we get

2x+0=10

x=5

putting x=5 in (i) we get

5+y=7

y=2

∴the number be 10×5+2=52         Ans