exam Maths Puzzle Numerical Ability

determine the equation of the line passing through the point (-2,3) and perpendicular to the graph of x+y=24

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exam Other Question

Find the mean and the median.

-2, -7/4, 3/4, 4, 9 A sewage treatment plant has two inlet pipes to its settling pond.
One can fill the pond in 10 hours, the other in 12 hours. If the first
pipe is open for 5 hours and then the second pipe is opened, how long
will it take to fill the pond?