There are 30 students in Marissa’s class. Each student started the year with 10 pencils. After two months, 1/5 of the total pencils in class were used. At the end of the year, only 1/3 of the remaining pencils were left. How many pencils were left?
There were 30 x 10 = 
<gadget id="calculator">30*10</gadget>
<output>300</output>
300 pencils in the class at the start of the year.
After two months, 300 x 1/5 = 
<gadget id="calculator">300*1/5</gadget>
<output>60</output>
60 pencils were used.
Thus, 300 - 60 = 
<gadget id="calculator">300-60</gadget>
<output>240</output>
240 pencils were left unused after two months.
Therefore, 240 x 1/3 = 
<gadget id="calculator">240*1/3</gadget>
<output>80</output>
80 pencils were left at the end of the year.

<result>80</result>