Answer to Q81
A + B - C = 6; A - B + C = 8. What is A?
A + B - C = 6 (eqn i)
A - B + C = 8 (eqn ii)
Add eqn i to eqn ii, it becomes
2A = 14
A = 14 ÷ 2
A = 7
Answer: 7
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