on monday 1/5 of the students went on a field trip. on tuesday 5/8 of the students that didn't go on monday had the opportunity to go. what is the fraction of students that didn't go?
number of students ---- x
monday, (1/5)x so (4/5)x did not go
tuesday, (5/8)(4/5)x went
or (1/2)x went
so 1/2 did not go