book Maths Puzzle Numerical Ability

Christine works at the Mountain View Restuarant on weekends. A customer left her a tip of $2.55 in quarters, dimes, and nickels. She was given 18 coins in all. How many coins of ea

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3 6 A coffee merchant has coffee beans that sell for $9 per
pound and $12 per pound. The two types are to be mixed to create 100 lb of a mixture that will sell for $11.25 per pound. How much of each type of bean should be used in the mixture?