exam Maths Puzzle Numerical Ability

An inlet pipe can fill a pool x hours while an outlet pipe can empty it in x+2 hours. If both pipes are open, what fraction of the pool is left unfilled after 1 hour?

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exam Other Question

Find an equation for the line with y-intercept 3 that is perpendicular to the line: y=2/3x-4 Use the point-slope form to find a general form of the equation of the linew whose slope is (-1/4) and that passes through (-2,3).