there are 45 students in the speech contest. Yesterday, 2/3 of them give their speeches. Today, 2/5 of the remaining students give their speeches. How many students still haven't given their speeches?
I believe it is 9. 2/3 of 45 is 30 which means on the first day 15 students needed to go still. On the second say 2/5 of them gave their speeches. 2/5 of 15 is 6. Which means 6 went. 15 - 6 is 9. 9 students still need to go.
