exam Maths Puzzle Numerical Ability

A population of students were polled: Do you like chocolate donuts or glazed? 20% said neither, 70% liked chocolate and 60% liked glazed. What percent liked both chocolate and glazed?

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Please i need help with this equations:
1. 2x-7(x-2)=3(x-4)
2. 7x-2=3x-6
3. 12+2(x-9)=3(x-2)
4. 4x-6=8-3
5. 2x-(3x+4)=2(x-5)
6. 1/5x-2=2/5 x+4 (note: one over five and two ov A landscaper wants to enclose a 90ft by 120ft rectangle with a walk of uniform width. He wants to use a supply of crushed rock that will cover 1744 square feet of walk. How wide should he make the walk?