What was the question for this implicit rationale, and corresponding answer?
Kyle has 2 + 3 = 5 glass bottles. He needs to make 15 x 5 = 75 origami stars.
 The answer: 75
The question: Kyle bought 2 glass bottles that can hold 15 origami stars each. He then bought another 3 identical glass bottles. How many stars must Kyle make to fill all the glass bottles he bought?