Question

Find the greatest number such that 5x6y is divisible by 12

Answer 1

5x6y is divisible by 12
5+x+6+y = 11+x+y = 2+x+y should be divisible by 3
5x6y is greatest number so,
x=9
y=4
then, 2+9+4 = 11+4 = 2+4 = 6
so 5964 is the greatest number divisible by 3 and 2 so 5964 is divisible by 12