The weights of 40 students were recorded. if the 75th percentile of their weights was 140 pounds, what is the total number of students who weighed more than 140 pounds?

Total students = 40

If 75% of the students weights 140 pounds, then (100 - 75) = 25% weighs more than 140 pounds.

So,

Students above 140 pounds = 25% of 40 
Students above 140 pounds = (25 / 100) * 40
Students above 140 pounds = (1  / 4) * 40
Students above 140 pounds =10

So, 10 students weighed more than 140 pounds