Question

If 37zy is a multiple of 3,where z is a digit whatmight be the possible values of z,y?

Answer 1

if we want to see if a no. is divisible by 3 or not we can check by adding the digits ... so...
3+7+x+y
which means:
x=1
y=1
or
x=2
y=3
or
x=4
y=4

and so on...
hope it helped ..