SOLUTION: If 4 small pizzas cost $15, find the cost of 9 small pizzas

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Question 668148: If 4 small pizzas cost $15, find the cost of 9 small pizzas
Answer by Adrianne15(25) About Me  (Show Source):
You can put this solution on YOUR website!
4 pizzas cost $15.
If I divide both by four to find the unit rate (price per one pizza), it'll look like this:
4%2F4+=+15%2F4
1+=+15%2F4
Now I can multiply this "price per pizza" by nine to find the cost of nine pizzas.
1%289%29+=+%2815%2F4%299
9+=+135%2F4
9+=+33.75
Therefore, nine pizzas will cost $33.75.