The club sold 60 pink or yellow rose bushes for a fundraiser. If three times as many pink rose bushes were sold compared to yellow rose bushes, how many yellow rose bushes were sold for the fundraiser?

A 15 bushes.

explanation

Let the number of yellow rose bushes be x.
Since there were three times as many pink rose bushes sold as yellow, the number of pink rose bushes can be represented by 3x.
Set up an equation and solve.
x + 3x = 60
4x = 60
x = 15