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There are
80
students in a speech contest. Yesterday,
1
4
of them gave their speeches. Today,
2
5
of the remaining students gave their speeches. How many students still haven't given their speeches?
yesterday, 1/4 of 80 =20 gave their speeches, so there are 80-20=60 students left. Today, 2/5 of 60=24 students gave their speeches, so there are 60-24=36 students who still haven't give their speeches another way to think of it is 80*(1- 1/4)*(1- 2/5)=80*(3/4)*(3/5)=36
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