Asked by :)
One half of the class got As. One third of the rest got Bs. One quarter of the remainder got Cs. One fifth of the others got Ds. What fraction of the class got Es or worse?
i know the answer is 1/10 but idk how to get there!!
i know the answer is 1/10 but idk how to get there!!
Answers
Answered by
Anonymous
B 1/3 * 1/2 = 1/6, left is 2/3 * 1/2 = 1/3
C 1/4 * 1/3 = 1/12, left is 3/4 * 1/3 = 1/4
D 1/5 * 1/4 = 1/20, left is 4/5 * 1/4 = 1/5
I get 1/5
C 1/4 * 1/3 = 1/12, left is 3/4 * 1/3 = 1/4
D 1/5 * 1/4 = 1/20, left is 4/5 * 1/4 = 1/5
I get 1/5
Answered by
Anonymous
Check
used = 1/2 + 1/6 + 1/12 +1/20 = 9/12 + 1/20 = (45 +3)/60 = 48/60 = 4/5
yes1/5 left to fail
used = 1/2 + 1/6 + 1/12 +1/20 = 9/12 + 1/20 = (45 +3)/60 = 48/60 = 4/5
yes1/5 left to fail
Answered by
:)
im confused because the answer sheet says 1/10
Answered by
Anonymous
Well, Well we disagree with the answer sheet. It happens :)
Answered by
Anonymous
That is why I went back up in reverse to check :)
Answered by
:)
ok thank you so much for your help!! :D
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