exam Maths Puzzle Numerical Ability

If I am given three points and ask to find a fourth so that they are vertices of a parallelogram, how do I find the fourth?

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exam Other Question

One pipe can fill a tank in 6 hours, and another pipe can fill the same tank in 8 hours. How long will it take to fill the tank if both pipes are used? Can someone show me how to write the rational expression in lowest terms?

r-13/13-r