Question

A number is formed of two digits : x is the ones digit and y is the tens digit. The sum of these digits is 11.
When it is inverted, the obtained number exceeds the triple of the given number by 5.
Whay is this number?

Answer 1

so the number is
$10y + x$
$x + y = 11$
$(10x + y) - 3(10y + x) = 5$
$7x - 29y = 5$
solving above equation we can get the number