Question

A number consist of two digits that add up to 7.If 27 is added to this number, the digit get reversed . Find the nnmber.​

Answer 1

Answer:

Let the number be 10x + y

x + y = 7......(1)

10x + y +27 = 10y + x

10x + y + 27 - 10y -x = 0

9x - 9y = -27

x - y = -3.....(2)

Add (1) + (2)

2x = 4

x = 2

put this value of x in (1)

y = 5

The number 10x + y = 10×2 + 5 = 25 Ans