Question

the sum of the digits of a two digit number is 9. The number is 6 times the unit digit. Find the number​

Answer 1

$x+y=9\\10x+y=6y\\\\x+y=9\\10x-5y=0\\\\x+y=9\\\underline{2x-y=0}\\3x=9\\x=3\\\\3+y=9\\y=6\\\\10\cdot 3+6=36$

36

Answer 2

Answer = 36

Hope it helps you