exam Maths Puzzle Numerical Ability

A boy and a girl work together to type a thesis and it takes them 6 hours. It would take the girl 5 hours more than the boy to type the thesis alone. How long would each need to type the thesis alone?

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Perform Indicated Operation
(5x^2-7x+2)-(3x^2-4x-7) How many ounces of a 15% saline solution must be added to 30 ounces of a 5% saline to make a 10% saline solution?