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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1/4 of students failed final exam; of rest, 1/3 scored A 
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1/4 of students failed final exam; of rest, 1/3 scored A
by foood on Sat Dec 31, 2011 8:59 am
- foood
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- Joined: Sat Oct 29, 2011 7:42 pm
Re: 1/4 of students failed final exam; of rest, 1/3 scored A 
by 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!
-
little_dragon - Posts: 152
- Joined: Mon Dec 08, 2008 5:18 pm
Re: 1/4 of students failed final exam; of rest, 1/3 scored A
by anonmeans on Sat Dec 31, 2011 1:47 pm
little_dragon wrote:so 1/2 is rite!
So 1/2 is right.
- anonmeans
- Posts: 31
- Joined: Sat Jan 24, 2009 7:18 pm
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