exam Maths Puzzle Numerical Ability

Could I have some guidance on figuring this problem. Y={1,2,3} find y

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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???? Write the equation of the line with slope - 1/2 and y-intercept (0, 3).