Question

At a​ school, 102 students play at least one sport. This is 40​% of the students at the school. How many students are at the​ school?

Answer 1

To get from 40% to 100%, divide by 2 and multiply by 5.
I.e. 40/2 = 20
20 x 5 = 100%

Do the exact same for 102
102/2 = 51
51 x 5 = 255 students

Answer 2

255 students is the answer to your problem