There are 20 + 11 = <<20+11=31>>31 students in second grade.

There are 31 x 2 = <<31*2=62>>62 students in third grade.

In total, there are 31 + 62 = <<31+62=93>>93 students.

# Answer

93
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
93
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?
train