book Maths Puzzle Numerical Ability

This one I am really lost on I need to express in the simplest radical form the square root of:

3 square root of 13/3

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book Other Question

the hight of a triangle is twice the base. the area is 49 square inches. find the base. Susie is making a mixture of acetic acid and water, which forms vinegar. If she has a mixture of 100ml of 2% acetic acid, how many ml of pure acetic acid should she add to produce