book Maths Puzzle Numerical Ability

A chemist has two mixtures of alcohol solution available to him, one that is 35% alcohol and another that is 77% alcohol. How many liters of the 35% alcohol solution should be add

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book Other Question
What is the formula for the volume of a rectangular prism? Iam not sure if Iam coming up with the right answer to this problem

Here it is...

Solve
3x^2 - 13x - 10 = 0

Iam coming up with x=-2/3 and x = 5

Thank You for any help you can provide.