Red roses come 3 to a package, and white roses come 5 to a package. If an equal number of red and white roses are wanted to make bouquets, what is the minimum number of each that can be purchased?

Well first, you want to find their least common multiple, which is 15.

So you want 15 red roses and 15 white roses.

In order to get that, you want 5 packages of red roses, because 3*5=15.

And you'll want 3 packages of white roses because 5*3=15.