Question

The sum of the digits of a two digit number is 9. The number obtained by interchanging its digits is
9 less than thrice the original number. Find the number

Answer 1

Answer:

27

Step-by-step explanation:

let the digit at unit place is x and tenth place is y

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

3(10y+x)-9=10x+y

-7x+29y=9 ,...........(2)

on solving (1) and (2), we get

x=7

y=2

number is 10y+x= 10*2+7=27