exam Maths Puzzle Numerical Ability

A barrel contains 30 gallons of 40% antifreeze. How many gallons of an 80% antifreeze solution should be added to make the barrel contain 50% antifreeze?

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Could you please help me solve this problem?

Number problems. If the square of 2 less than an integer is 16, find the number(s).

Thank you, Please help me with these problems.I cant figure them out.

SIMPLIFY EACH OF THE FOLLOWING.BEGIN WITH THE INNERMOST PARENTHESES.

1). (8x-y)-[-(2x + y)-(3x-6y)]

2). 6