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

### Instruction:
 Mary earns $20 washing cars and $40 walking dogs each month. If she puts half of that money away each month how long would it take her to save $150?


### Response:
 Cada mes gana 20+40=$<<20+40=60>>60
Cada mes ahorra 60/2=$<<60/2=30>>30
Para ahorrar $150 le tomará 150/30=<<150/30=5>>5 meses