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Monday, July 24 2017 @ 09:44 AM CDT
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 CHIJ St Nicholas 2011 SA1 Q29
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By: geniuskids (offline)  Tuesday, May 01 2012 @ 08:19 AM CDT (Read 1149 times)  
geniuskids

Please help me solve this question with detailed working. Many thanks!

Q29 The mass of a container, completely filled with biscuits, is 11/10 kg. When it is 1/3 filled with biscuits, its mass is 7/10kg. What is the mass of the empty container?

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By: echeewh (offline)  Tuesday, May 01 2012 @ 08:36 PM CDT  
echeewh

Hey there,

Following pls find the worked solution (using Simultaneous / Compare & Replace / Elimination technique):

C + B = 11/10 ----- (1)
C + 1/3 B = 7/10 ---- (2)

(1) - (2):
B - 1/3 B = 11/10 - 7/10
2/3 B = 4/10
1/3 B = 2/10

Substitute 1/3 B into (2):
C + 2/10 = 7/10
C = 7/10 - 2/10 = 5/10 = 1/2 kg

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

Trust the above helps.

Cheers,
Edward

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By: geniuskids (offline)  Wednesday, May 02 2012 @ 01:29 AM CDT  
geniuskids

Many thanks Edward! Greatly appreciate that.

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