Question: Derek has $40. He spends $14 on lunch for himself, $11 for lunch for his dad, and $5 on more lunch for himself. His brother Dave has $50 and only spends $7 on lunch for his mom. How much more money does Dave have left than Derek? Think carefully first, then make a decision:
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Derek has 40 - 14 - 11 - 5 = 10 dollars left. Dave has 50 - 7 = 43 dollars left. Dave has 43 - 10 = 33 more dollars left than Derek. So the answer is 33.
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