An artist uses 3 ounces of paint for every large canvas they cover, and 2 ounces of paint for every small canvas they cover.  They have completed 3 large paintings and 4 small paintings.  How many ounces of paint have they used?
The large paintings have used 3 * 3 = <T>multiply(3, 3)=9 ounces.
The small paintings have used 2 * 4 = <T>multiply(2, 4)=8 ounces.
In total, all the paintings have used 9 + 8 = <T>add(9, 8)=17 ounces.
