How many five-digit numbers of the form 32x5y are divisible by 72?

Thanks for helping! Also- please, please, PLEASE explain your answers; or else just don't; it's the same as not answering because I didn't learn anything)

PocketThePenguin Sep 18, 2020

#1**+1 **

The prime factorization of 72 is $2^3*3^2$, and so in order of 32x5y to be divisable by 72, it's prime factorization must include $2^3*3^2$.

Guest Sep 18, 2020