
By: sweetphone123 (offline) Tuesday, September 20 2011 @ 12:08 PM CDT (Read 1545 times)



sweetphone123 
Question:
There are 30 pupils in a class. 17 join computer club, 19 join basketball and 2 do not join any CCA.
How many pupils are in both computer clubs and basketball?
Answer :13
Does anyone know how to solve this problem ?
Thanks

Newbie
Registered: 04/02/11 Posts: 4





By: w13158 (offline) Tuesday, September 20 2011 @ 09:13 PM CDT



w13158 
Can confirm whether the question is complete.

Newbie
Registered: 08/01/11 Posts: 8





By: pkrdd (offline) Wednesday, September 21 2011 @ 02:10 AM CDT



pkrdd 
I agree with W13158. Question seems not complete either the numbers in question are wrong or the answer.
I can only think of below way to solve this question but answer doesn't tally.
Total pupils in class = 30
Pupils who do not join any CCA = 2
Pupils effectively joined in 1 or more CCA = 30 2 = 28
Total pupils in CCA all together = pupils in comp club + pupils in b'ball club = 17 + 19 = 36
So Pupils common in both CCA's = 36  28 = 8
can anyone help to correct if my solution is wrong?

Junior
Registered: 01/11/10 Posts: 16





By: angietoh (offline) Wednesday, September 21 2011 @ 03:05 AM CDT



angietoh 
My answer is the same as pkrdd. I solve the question using a venn diagram.

Newbie
Registered: 09/23/10 Posts: 14
Location: SG





By: sweetphone123 (offline) Thursday, September 22 2011 @ 07:57 AM CDT



sweetphone123 
Yup, and so do i.
i get 8 also.
the question is complete.
This is a prelim question and answer is given by the teacher.
i am puzzled too, which is why i am raising it up.
Thanks

Newbie
Registered: 04/02/11 Posts: 4





By: pkrdd (offline) Friday, September 23 2011 @ 01:50 AM CDT



pkrdd 
Hmmm interesting .. instead of scratching our heads, best is to go back and ask teacher on solution. drop her an email. since PSLE is close lets not waste time on this
For me I really doubt if all 3 of us could go wrong. Most likely answer is wrong or typo error in numbers. May be total students are 25 (not 30) or may be pupils who did not join any CCA are 7 (not 2) !!!

Junior
Registered: 01/11/10 Posts: 16





By: ZombieFreak (offline) Friday, September 23 2011 @ 05:26 AM CDT



ZombieFreak 
Quote by: sweetphone123Yup, and so do i.
i get 8 also.
the question is complete.
This is a prelim question and answer is given by the teacher.
i am puzzled too, which is why i am raising it up.
Thanks
mkai

Junior
Registered: 10/29/10 Posts: 17



