+231 Adam has 15 of a certain type of rare coin and is interested in knowing how much this collection is worth. He discovers that 5 of these coins are worth 12 dollars in total. Assuming that the value of each coin is the same, how many dollars is his entire collection worth?
+36915 12 d / 5c = 2.4 dollars/coin
2.4 dollars/coin x 15 coins = $........
