Question

If we add 27 for two digit number let it be xy it becomes interchanged yx find the number

Answer 1

Answer:

Step-by-step explanation:

let the number be xy

x+y=9...............(1)

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

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

9x-9y=-27

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

add equation 1 and 2

we get

x=3

substitute it in eq 1

y=6

so the number is 36