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?
For the second month, Sam earned $200 + $150 = $
<gadget id="calculator">200+150</gadget>
<output>350</output>
350.
So, he earned a total of $200 +$350 = $
<gadget id="calculator">200+350</gadget>
<output>550</output>
550 for the first two months.
Therefore, he spent $550/$10 = 
<gadget id="calculator">550/10</gadget>
<output>55</output>
55 hours on math tutoring for the first two months.

<result>55</result>