exam Maths Puzzle Numerical Ability

what two consecutive even integers whose sum is 400?

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exam Other Question

Solve each of the following systems by addition. If a unique solution does not exist, state whether the system is inconsistent or dependent.
x+5y=10
-2x-10y=-20 2x-1 / x^2 + x - 6 - x+2 / x^2 + 5x + 6