Let X be the number of students last year.

The number of students this year is X+X*20% = 960

Combining like terms, we get X*1.2 = 960

Dividing both sides by 1.2, we get X = 800 students.

# Answer

800
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
In my school, the number of students has increased by 20% this year. The number of students this year is 960. How many students were there last year?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
800
In my school, the number of students has increased by 20% this year. The number of students this year is 960. How many students were there last year?
train