What was the question for this implicit rationale, and corresponding answer?
To make 200 of the first type of shirt, they will need 200 * 3 = 600 buttons. To make 200 of the second type of shirt, they will need 200 * 5 = 1000 buttons. To manufacture 200 each of both types of shirts, they will need to use 600 + 1000 = 1600 buttons.
 The answer: 1600
The question: The GooGoo brand of clothing manufactures two types of shirts, one with 3 buttons and the other with 5 buttons. A large department store ordered GooGoo to manufacture 200 of each type of shirt. How many buttons will the GooGoo brand use to manufacturer all of the shirts for this order?