exam Maths Puzzle Numerical Ability

Solve

x + y + z = 5

x - 2y + z = 8

3x - y - z = 3

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exam Other Question

-36a�b + 21ab� - 3b� How do I get the answer for Q=LvM and Q=LfM if one is melting 500g of 0c and the other is 500g of 100c water into steam