Nanyang Pri Sch 2009 P6 CA1 Math Paper 2 Q8

Wilson and Yi Lin had $71 altogether. Yi Lin and Patrick had $105 altogether. Wilsom hand 3/5 of the money that Patrick had. How much money did Yi Lin have?

Solution

Yi Lin + Patrick
? + 5 units --> $105

Yi Lin + Wilson
? + 3 units --> $71

5 units - 3 units --> $105 - $71
2 units --> $34
1 unit --> $34 divided by 2 = $17

Yi Lin + Wilson
? + 3 units --> $71
? + (3 x $17) --> $71
? + $51 --> $71
? --> $71 - $51 = $20

Answer: $20

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