SOLUTION: two thirds of the class finished the test on time. what fraction of the class did not finish the test on time

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Question 108942: two thirds of the class finished the test on time. what fraction of the class did not finish the test on time
Answer by Crashy(2) About Me  (Show Source):
You can put this solution on YOUR website!
one third of the class doesont finish the test on time
beacause
the whole population of the class is 3/3
and 2/3 completed the homework on time
therefore...............
suppose the students who haven't done the homework is"x"
x + 2/3 = 3/3
x = 3/3 - 2/3
x = 3-2/3
x = 1/3 ANS