exam Maths Puzzle Numerical Ability

domain and range of y=2/3x-5

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Warren has 40 coins; nickels dimes and quarters worth $4.05. He has seven more nickels than dimes. How many quarters does he have? 2.When solving an inequality, when is it necessary to change the direction of the inequality symbol? Can you give a real life example of this?

Hello i am having trouble solving this question, can you help? Thanks!!