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? Let's answer step by step:
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. The answer: 800.