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Sunday, October 22 2017 @ 05:47 PM CDT
 Forum Index >  Test Paper Related >  Primary 6 Matters
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By: mdrafiq777 (offline)  Tuesday, June 12 2012 @ 09:01 AM CDT (Read 1131 times)  
mdrafiq777

Hi there,
Could anyone please help me with the following question.

Many thanks in advance!!

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By: echeewh (offline)  Tuesday, June 12 2012 @ 06:56 PM CDT  
echeewh

Hey there,

Following pls find the worked solution:

This is also called a Rate question.

In 1 hr,
Taps A + B can fill 1/3 container --- (1)
Taps C + B can fill 1/4 container --- (2)
Taps A + C can fill 1/6 container --- (3)

(1) + (2) + (3):

2A + 2B + 2C = 1/3 + 1/4 + 1/6 = 9/12 = 3/4
A + B + C = 3/4 ÷ 2 = 3/8

So, in 1 hr taps A, B, C will fill up 3/8 container.
To fill up whole container, it would take ...

1 ÷ (3/8) = 8/3 = 2 2/3 hr ( 2 hr 40 min )

============================================

Trust this helps.

Do let me know if the answer is different from your answerkey.

Cheers,
Edward

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By: mdrafiq777 (offline)  Wednesday, June 13 2012 @ 08:51 AM CDT  
mdrafiq777

Thanks


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