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Saturday, February 24 2018 @ 07:51 PM CST
 Forum Index >  Test Paper Related >  Primary 6 Matters
 P6 Q17
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By: JessicaTan (offline)  Friday, August 23 2013 @ 05:09 AM CDT (Read 677 times)  

Hi, Please help with the working solution
Pls see the attached file.


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By: eqkt (offline)  Friday, August 23 2013 @ 09:58 AM CDT  

Hi Jessica Tan,
Below is my worked solution:

u---> units

Yellow : Red
2 : 3

3/4 of the red beads were given away, thus we change the 3 units of red to 12 units as it is then possible to divide it by 3/4. Yellow beads would then be 2 x 4 = 8 while Red beads would be 3 x 4 = 12.

1/4 x 12= 3
3+8=11 (units of total of red beads and yellow beads at the end)
11u+1/2 blue beads --> 920
22u+1 blue beads--> 920 x 2 =1840
12+8=20 (units)

However, if we add up the units for the red beads and the yellow beads, the total is only 20 units. Thus there was an extra of 2 units between 1680 and 1840.

2 units-->160
1 unit--> 160/2=80
12 units-->80x12=960 (ans)

There are total of 12 units for red beads at first.

Cheers, Big Grin

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