exam Maths Puzzle Numerical Ability

. How many pints of a 9% cleaning solution must be mixed with 10 pints of a 13%
cleaning solution to give a 11% solution?

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exam Other Question

The base of an isosceles triangle is 12 in. less than the length of the equal sides. If the perimeter of the triangle is 39 in., find the length of each of the sides. D=2M
M=B-4
B=D-17
What is the value of B?