exam Maths Puzzle Numerical Ability

i dont no how to do number 5

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17 coins consisting of nickels dimes and quarters are collected for a newspaper vending machine. the total value of the coins is $2.05 and there are 4 more dimes than quarters. find the number of each coin type. 4) A farmer decides to enclose a rectangular garden, using the side of a barn as one side of the rectangle. What is the maximum area that the farmer can enclose with 60 ft of fence? What should the dimensions of the garden be to give this area?