exam Maths Puzzle Numerical Ability

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

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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? Can you please check this work for me. I have it completed. It is not from a text book. Thank you!

1. The equation gives the distance, D, in miles that a person can see to the