Question

Sum of two digit number and number obtained by reversing the order of it is $121$.Find the sum of digits of the original number

Answer 1

Let, the two digited number be $XY$ and the number obtained by reversing the digits is $YX$

Scince, The sum is $121$

i.e., $(10x+y)+(10y+x)=121$

$⟹11x+11y=121$

$\therefore x+y=11$

which is our required equation.