exam Maths Puzzle Numerical Ability

One computer can process a payroll in 60 minutes. A newer computer can process a payroll in 40 minutes. How long would it take to process the payroll if both computers worked together?

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exam Other Question

How do I find the ordered pairs for this equation 2x+y=10 I am not sure how to start I think I SOLVE X AND THEN Y.aM I CORRECT? I really need help to solve the following

-k(-2-3) - (-2)(-k-5) = -2-(-2k+4) + 3 times the square root of -27