book Maths Puzzle Numerical Ability

Find Ex for the following set of numbers:

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

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

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book Other Question

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? The sum of three times a number and 7 more than the number is the same as the difference between -11 and twice the number. What is the number?