Question

given a three digit number x5y where X is the digit at hundreds place and y the digit at ones place the number X5y is divisible by 9 Find the least positive value of x + Y

Answer 1

The divisibility rule of nine
Sum of all digits if the sum we get is divisible by 9 then the number is divisible by 9
to make the sum of number nine
we can take 1 and 3 or 2 and 2
so X+y=1+3 or 2+2
means X+y =4