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 Nanyang Pri 2009 SA2 Paper 2 Qn 18
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By: SHLer (offline)  Thursday, October 28 2010 @ 09:00 PM CDT (Read 1856 times)  
SHLer

Need help to solve the following problem sum:

Mrs. Raju bought 20 bottles of milk & 5 boxes of cornflakes from the supermarket. If she had bought these items at 20% discount, the amount of money she saved could buy another 3 more boxes of cornflakes at the usual price. The usual price of a bottle of milk was $2.15. What was the usual price of a box of cornflakes?

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By: GIM (offline)  Sunday, November 07 2010 @ 07:25 AM CST  
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20 bottles of milk cost : 20 x $2.15 = $43

20%Savings from all milk : 0.2 x $43 = $8.60

20%Savings from all cornflakes : 0.2 x 5C = C (assuming C is 1 box of cornflakes)

Total savings for both items : $8.60 + C

Since savings can buy 3 boxes of cornflakes, therefore $8.60 + C = 3C
3C - C = $8.60
2C = $8.60
C = $4.30

Usual price of a box of cornflakes was $4.30

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