There are 20 boys and 11 girls in the second grade and twice that number in the third grade. How many students are in grades 2 and 3?
There are 20 + 11 = 
<gadget id="calculator">20+11</gadget>
<output>31</output>
31 students in second grade.
There are 31 x 2 = 
<gadget id="calculator">31*2</gadget>
<output>62</output>
62 students in third grade.
In total, there are 31 + 62 = 
<gadget id="calculator">31+62</gadget>
<output>93</output>
93 students.

<result>93</result>