SOLUTION: Last time, one out of every 4 students in our class was absent. This time, after Jen came back, only one out of every 5 students is absent. How many students are there in our class

Question 1077778: Last time, one out of every 4 students in our class was absent. This time, after Jen came back, only one out of every 5 students is absent. How many students are there in our class? How many students are not here today?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
number is x
(x/4) were absent
when number is x
(x/5) absent is (x/4)-1
multiply everything by 20
4x=5x-20
-x=-20
x=20
5 absent is 1/4
when one returns, 4 absent, 1/5.
20 students
4 not here today.
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