SOLUTION: the third hour chemistry class, of 24 pupils could prepare m solutions in t hours. if 4 pupils were absent, how long would it take to prepare 60 solutions?

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Question 1145569: the third hour chemistry class, of 24 pupils could prepare m solutions in t hours. if 4 pupils were absent, how long would it take to prepare 60 solutions?
Answer by josgarithmetic(39843) About Me  (Show Source):
You can put this solution on YOUR website!
r, rate of prep of solutions for 1 student
x, the unknown hours time asked
t and m are assumed constants

If 4 students of class of 24 absent, this is 20 students attending.

system%2824r%2At=m%2C20r%2Ax=60%29
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%2820rx%29%2F%2824r%2At%29=60%2Fm
%284%2A5x%29%2F%284%2A6t%29=60m
%285%2F6%29xt=60m
x=60m%286%2F5%29%281%2Ft%29
highlight%28x=72m%2Ft%29hours