exam Maths Puzzle Numerical Ability

Ok how do you solve a linear system by using the combonation method?

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exam Other Question

Simplify: -(-28). With only the small valve open, all of the liquid can be drained from a large vat in 4 hours. With only the large valve open, all of the liquid can be drained from the same vat in 2 hours. How long would it take to drain the vat with both valves open?