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Primary 1 | Maths

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2A + 3 = C

C - 9 = A

2A + 3 - 9 = A

2A - 6 = A

A = 6

So C = A + 9 = 6 + 9 = 15

A + B + C = 9 + 15 = 24

However, if 9 - C = A instead,

Then 2(9 - C) + 3 = C

18 - 2C + 3 = C

21 = 3C

C = 7

A + B + C = 9 + 7 = 16

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