Below is an instruction that describes a task. Write a response that appropriately completes the request in Spanish. Please answer in Spanish.

### Instruction:
 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?


### Response:
 Derek tiene un costo total de almuerzo de $14 + $11 + $5 = $<<14+11+5=30>>30.
Derek tiene $40 − $30 = $<<40-30=10>>10 restantes
Dave tiene $50 − $7 = $43 restantes.
Dave tiene $43 − $10 = $33 más que Derek.