exam Maths Puzzle Numerical Ability

How many pounds of coffee at 4.00 a pound must be mixed with coffee at 20.00 a pound to make 50 pounds of coffee that are worth 10.00 a pound?

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The sum of the ages of the three Romano brothers is 63.if their ages can be represented as consecutive integers,what is the age of the middle brother? I am trying to make a real life application of a linear function using this information.
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