exam Maths Puzzle Numerical Ability

Problem Solving: How to solve:
Supppose you have 10 coins that total $0.85. Some coins are dimes and others are nickels. How many of each do you have????

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Can a tutor help me please* My problem is to solve and write the answer in set notation: |3x-6|>3

Thank you, thank you, thank You!!! Perform the indicated operations. Simplify if possible

8/x+8 - 40/8x