1/4 of students failed final exam; of rest, 1/3 scored A  TOPIC_SOLVED

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1/4 of students failed final exam; of rest, 1/3 scored A

Postby foood on Sat Dec 31, 2011 8:59 am

In Mr. Joe's class, 1/4 of the students failed the final exam. Of the remaining class, 1/3 scored an A. What fraction of the class passed but didnt get an A?

a)1/4
b)5/12
c)1/2
d)7/12

i got c) because I made the teacher have 100 kids, and 1/4 = 25 failed. then 75 (remaining) x 1/3= 25 got an A. The rest of them is 50 kids, and 50/100 = 1/2, so thats why i got c.

the answer is d. i tried working backwards but it didnt help.
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Re: 1/4 of students failed final exam; of rest, 1/3 scored A  TOPIC_SOLVED

Postby little_dragon on Sat Dec 31, 2011 1:41 pm

foood wrote:In Mr. Joe's class, 1/4 of the students failed the final exam. Of the remaining class, 1/3 scored an A. What fraction of the class passed but didnt get an A?

a)1/4
b)5/12
c)1/2
d)7/12

i got c) because I made the teacher have 100 kids, and 1/4 = 25 failed. then 75 (remaining) x 1/3= 25 got an A. The rest of them is 50 kids, and 50/100 = 1/2, so thats why i got c.

the answer is d. i tried working backwards but it didnt help.

1/4 flunked means 3/4 passed
1/3 of 3/4 = 1/4 got A
so 1/2 is rite!
:wave:
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Re: 1/4 of students failed final exam; of rest, 1/3 scored A

Postby anonmeans on Sat Dec 31, 2011 1:47 pm

little_dragon wrote:so 1/2 is rite!

So 1/2 is right. :roll:
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