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 Nanyang P6 CA1 2011 Question 11 of Paper2
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By: sundarshoba (offline)  Thursday, February 02 2012 @ 03:21 PM CST (Read 2719 times)  
sundarshoba

Please help to solve Question 11 of Paper2 : Sally, Yiling and Ali shared a bag of beads. Sally received 3/4 of the bag of beads and 3/4 of a bead. Yiling received 3/4 of the remaining bag of beads and 3/4 of bead. Ali received the last bead in the bag. How many beads did Sally receive? Thanks

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By: awyw1201 (offline)  Thursday, February 02 2012 @ 10:26 PM CST  
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Quote by: sundarshoba

Please help to solve Question 11 of Paper2 : Sally, Yiling and Ali shared a bag of beads. Sally received 3/4 of the bag of beads and 3/4 of a bead. Yiling received 3/4 of the remaining bag of beads and 3/4 of bead. Ali received the last bead in the bag. How many beads did Sally receive? Thanks




Work backwards
Yiling and Ali---(1+3/4) x4=7
Sally---- (7+3/4) x 3 + 3/4= 24

Ans: 24 beads

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By: pkrdd (offline)  Friday, February 03 2012 @ 04:19 AM CST  
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Hi,

Can you explain why 1+3/4 in step 1 is multiplied with 4. similarly in step 2?

Thanks in advance

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By: awyw1201 (offline)  Friday, February 03 2012 @ 07:25 AM CST  
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Quote by: pkrdd

Hi,

Can you explain why 1+3/4 in step 1 is multiplied with 4. similarly in step 2?

Thanks in advance



Because if we consider the number of units for both Yiling and Ali, the total number of units should be 4 units.
Thus, 1 unit----1+3/4=1.75
4units -----1.75x 4= 7

Hence, consider Yiling +Ali+ Sally----4 parts
Then, 1 part----7+3/4 =7.75
Since we want to find out what Sally has,
then 3 parts---- 7.75 x 3= 23.25
and 23.25 + 3/4= 24

Big Grin

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By: sundarshoba (offline)  Sunday, February 05 2012 @ 06:21 AM CST  
sundarshoba

but why is the total number of units four unit .Can you demonstrate with model Big Grin Thanks Razz

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By: awyw1201 (offline)  Monday, February 06 2012 @ 12:26 AM CST  
awyw1201

Quote by: sundarshoba

but why is the total number of units four unit .Can you demonstrate with model Big Grin Thanks Razz




Hi, attached is the model. Hope this helps:-)

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By: pkrdd (offline)  Monday, February 06 2012 @ 01:41 AM CST  
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Excellent. Thank you Smile

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By: sundarshoba (offline)  Monday, February 06 2012 @ 02:55 AM CST  
sundarshoba

Thank you very much for the model

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By: awyw1201 (offline)  Monday, February 06 2012 @ 10:10 AM CST  
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Glad it was helpful:-)

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