Nanyang Pri Sch 2009 P6 CA1 Math Paper 2 Q4

Box A contains only one-dollar coins. Box B contains only fifty-cent coins and Box C contains only twenty-cent coins. Box A has 5 times as many coins as Box C. Box B contains 12 coins fewer than Box A. Box C contains half the number of coins in Box B. How much money is there in Box B?

Solution

2 units --> 5 units - 12
3 units --> 12
1 unit --> 12 divided by 3 = 4

(Box B)
5 units - 12
-->(5 x 4) - 12
= 20 - 12
= 8 (coins)

8 coins x $0.50 = $4

Answer: $4

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