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This is a simultaneous equation question.

     R1 R2   R1   R2 × 7 R1 + R2
Dillion   3 1 3  7 10
Charles 7 -1 7  -7 0
Total  400   20 400  140 540

10u = 540

1u = 540 ÷ 10 =54

3u = 54 x 3 = 162

400 – 162 = 274

274 – 162 = 112

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