exam Maths Puzzle Numerical Ability

How much pure water must be mixed with 3 pints of 70% developer to produce a misture that is 13% developer?

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exam Other Question

Given: L is the midpoint of line JN, line PJ is congruent line QN, line PL is congruent line QL, angle PKJ and angle QMN are right angles
Prove: triangle PKJ congruent triangle QMN
An issocles triagle had a perimeter of 370mm.the base of the triangle is 40mm longer than the two equal side.What is the length of each side.