book Maths Puzzle Numerical Ability

the problem is Aaron has a total of 14 dimes and quarters. the total value of the coins is $2.15. how many dimes and how many qarters does he have?
i have the equations d+q=14, d

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Dr. Dixit jogged a total of 6600 yards in three nights. If each night he increased his distance 440 yards, how far did he jog on the first night? Instructions: find the valueof the dicriminantand determine the number of real solutions for each equation.

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