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Tuesday, September 19 2017 @ 12:05 PM CDT
 Forum Index >  Test Paper Related >  Primary 5 Matters
 Help needed for P5 Math Q.
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By: DEVBALAJI (offline)  Wednesday, October 19 2011 @ 10:26 PM CDT (Read 1229 times)  
DEVBALAJI

Hello to All!
I need help with this math question:

Bobby places 12 cards on a table. Each card is either red or black in colour.
If the fraction of black cards is 7/12, what is the smallest number of additional
cards that Bobby needs to put on the table, so that the fraction of black cards
become 5/8 ?

Thank you

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By: myluckystar111 (offline)  Thursday, October 20 2011 @ 03:14 AM CDT  
myluckystar111

Hi
This problem involves ratio.

For fraction of black card to be 5/8,

Black : Red
5 : 3
10 : 6

Originally 7 Black 5 Red (Total 12 cards) , now 10 Black 6 Red (Total 16 cards)
Therefore Bobby needs to add 4 cards (Subtract 12 from 16)

Ans: 4 Cards

Hope this helps. Big Grin

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By: DEVBALAJI (offline)  Saturday, October 22 2011 @ 01:44 AM CDT  
DEVBALAJI

Thank you for the answer!
Big Grin

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