Question

The sum of a two digit number and the number obtained by reversing the order of its digits is $121$. If units and ten's digit of number are $x$ and $y$ respectively, then write the linear equation representing the above statement.

Answer 1

Let the number be $10x+y$

According to question $10x+y+10y+x=121$

$\to 11x+11y=121$

$\to x+y=11$