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Tuesday, August 22 2017 @ 01:23 PM CDT
 Forum Index >  Test Paper Related >  Primary 5 Matters
 P5 Math SA2 2009 Nanyang Question 16
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By: TEOTECKWAH (offline)  Monday, October 11 2010 @ 08:58 AM CDT (Read 1993 times)  
TEOTECKWAH

Can someone help me with this question.

Thank

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By: kyChang (offline)  Tuesday, October 12 2010 @ 10:08 PM CDT  
kyChang

254009 should be written as Two Hundred Fifty-four Thousand and Nine only

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By: SHLer (offline)  Friday, October 22 2010 @ 10:44 PM CDT  
SHLer

Hi, i believe u r asking abt Qn 16 on Paper 2 right? I juz finished marking my girl's paper so here's the solution.

Qn : Ali, Bala, Clyde & Dingyi shared a box of pens. Ali rec'd 20% of the total no. of pens which Bala, Clyde & Dingyi rec'd altogether. Bala rec'd 50% of the total no. of pens which Ali, Clyde & Dingyi rec'd altogether. Clyde rec'd 80% of the total no. of pens which Ali, Bala & Dingyi rec'd altogether. Dingyi rec'd 6 pens. How many pens were in the box at first?

The solution is to use ratio method as follows:

A : BCD B : ACD C : ABD
20 : 100 50 : 100 80 : 100
1 : 5 (x3) 1 : 2 (x6) 4 : 5 (x2)
6 3 9 (total for each gp different)
Since LCM is 18, make each gp total into 18:
3 : 15 6 : 12 8 : 10 (total for each gp now 18)

A+B+C = 3+6+8 = 17
D = 18-17 = 1

Since D has 6 pens,
1 unit -> 6 pens
18 units -> 6 X 18 = 108 pens at first

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