exam Maths Puzzle Numerical Ability

PROBLEM SOLVING: hOW TO SoLve
The difference of the measure of two supplementery angles 35*. Find both angle measures. The sum of the measures of supplementary angles is 180*.

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exam Other Question
Suppose that one solution is 50% alcohol and another solution is 80% alcohol. HOw many liters of each solution should be mixed to make 10.5 liters of a 70% alcohol solution? Can anyone help getting this set up and solved? Thanks

Solve 5x^2 + 2x - 1 = 0

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