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?
##Solution## Derek has 40-14-11-5 = <<40-14-11-5=10>>10 dollars left
Dave has 50-7 = <<50-7=43>>43 dollars left.
Dave has 43-10 = <<43-10=33>>33 more dollars left than Derek.
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