Please answer the following question by reasoning step-by-step.
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?

17
The large paintings have used 3 * 3 = 9 ounces.

The small paintings have used 2 * 4 = 8 ounces.

In total, all the paintings have used 9  + 8 = 17 ounces.

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So, the final answer is 17