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Friday, July 21 2017 @ 03:37 PM CDT
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 2013 Prelims! P6 Maths! Red Swastika Paper 2 Q9
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By: geniuskids (offline)  Saturday, September 21 2013 @ 08:29 AM CDT (Read 1656 times)  
geniuskids

Q9) Beth baked some chicken pies and curry puffs, When she away 45 chicken pies, the percentage of chicken pies that she had
decreased from 60% to 30%. How many curry puffs did Beth bake?

Can someone pls advise a method other than using algebra?

Thanks

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By: echeewh (offline)  Saturday, September 21 2013 @ 04:34 PM CDT  
echeewh

Hey <

Following is my worked solution.:

<before>

CH : CU
60 : 40
3 : 2 -- (1)

<gave away 45 CH>

30 : 70
3 : 7 -- (2)

this infers that the number of CU remains unchanged <before> and <after>; hence, we can apply the <Unchanged Qty> concept here to make the ratio component for CU to be the same <before> and <after>.

(1)x7:
21 : 14 -- (3)

(2)x2:
6 : 14 -- (4)

As 45 CH were given away,

21u - 6u = 45
15u --> 45
1u --> 3

Number of CU (Curry Puffs) baked = 14u --> 14 × 3 = 42

===========

Trust this helps.

Do let me know again if this is different from your <Answerkey> or if there's further clarification.

Cheers,
Edward.

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By: geniuskids (offline)  Saturday, September 21 2013 @ 08:27 PM CDT  
geniuskids

Thanks again Edward, Yes got it now!

The reason why i did not state answer key for this is I think answer given is wrong as it was given as:

Answer key : 63 chicken pies

when they actually ask for "curry puff". . And yes its 42 curry puffs as they actually state it right above Eek!

Many thanks

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