exam Maths Puzzle Numerical Ability

A chemist needs 130 milliliters of a 65% solution but has only 56% and 95% solutions available. Find how many millimeters of each that should be mixed to get the desired solution.

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exam Other Question

Solve each of the following systems by substitution

5x - 2y = -5
y - 5x = 3

Please help, I understand the addition method but not the substitution
#24
Quality control
Over a period of time, the manufacturer of a Carmel-center candy bar found that 3.1% of the bars were rejected for imperfections
(a) If a candy bars are