Question

20 points! Find the greatest number such that 7x4y is divisible by 12

Answer 1

Answer:

7x4y is divisible by 12

7+x+4+y = 11+x+y = 2+x+y should be divisible by 3

7x4y 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