exam Maths Puzzle Numerical Ability

Sally paints a house in 4 hours, John can paint the same house in 6 hours, how long will it take for Sally and John to paint the house together?

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exam Other Question

An athlete runs at a rate of 3 meters per second around a 400- meter track. Which equation best represents the distance covered if he has already run 2 laps?
A. D=400 + 3s
B. D=800 + 3s
C. D=800 + 6s
D. D=800 - 3s Explain why we cannot square a sum by simply squaring each term of the sum. For example, (a+b)square 2 is not equal to a square + b square. Provide appropriate example.