book Maths Puzzle Numerical Ability

A chemist has one solution that is 20% acid and a second that is 50% acid. How many gallons of each should be mixed together to get 10 gallons of a solution that is 30% acid?

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book Other Question

Please help me with this question: Name the x-intercepts and the vertex of the graph of y=(x+3)(x-1). Then sketch the graph of the function. Find Ex for the following set of numbers:

-3, 5, -4, 8, -6, 10, -5

A) 5 B) 0 C) 2 D) 6