exam Maths Puzzle Numerical Ability

Please help me find the other extreme: ratical 12 is the gepmetric mean between a and b. Find b if a = 3.

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exam Other Question

Find the distance between -2 and 13 using absolute value. How many pints of a 9% cleaning solution must be mixed with 10 pints of a 13%
cleaning solution to give a 11% solution?