Imagine a question and stream-of-consciousness explanation for which this is the answer: 15
Question: Michael has 4 packs of crayons and wants to buy 2 more. One pack of crayons costs $2.5. How much are all the packs of crayons Michael will have after the purchase worth?
Stream-of-consciousness: After buying 2 more packs, Michael is going to have 4 packs + 2 packs = 6 packs of crayons. In total all packs are going to be worth 6 packs * $2.5 / pack = $15.