There are 80 students in a speech contest. Yesterday, 1/4 of them gave their speeches. Today, 3/5 of the remaining students gave their speeches. How many students still haven't given their speeches?

so 24 is the answer

Step-by-step explanation:

first 1/4 is 20 out of 60

Second, we have to work out one fifth. The easiest way to do this is to divide 60 by five.

60 divided by 5 = 12

(We should know this from our times tables, 5x12=60)

We then times the fifth by three to work out three fifths.

12 x 3 = 36

We can then check this by working out two fifths and checking that both the answers add up to make 60.

We work out two fifths the same way we work out three, timesing by the value for one fifth.

12 x 2 = 24

24 + 36 = 60

So we know that we were correct and our final answer is

3/5 of 60 = 36.

then 24 + 36 = 60

so 24 is the answer