human
Sam earns $10 an hour on Math tutoring. For the first month, he earned $200; and for the second month, he earned $150 more than the first month. How many hours did he spend on tutoring for two months?
assistant
How much did Sam earn in the second month? ** For the second month, Sam earned $200 + $150 = $<<200+150=350>>350.
How much did Sam earn in the first two months? ** So, he earned a total of $200 +$350 = $<<200+350=550>>550 for the first two months.
How many hours did Sam spend on tutoring for the first two months? ** Therefore, he spent $550/$10 = <<550/10=55>>55 hours on math tutoring for the first two months
#### 55