exam Maths Puzzle Numerical Ability

mary has six dollars in quarters,dimes and nickels.She has three times as many dimes as nickels and 17 quarters. how many nickels and how many dimes does she have.

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exam Other Question
Can anyone give me the two solutions to this absolute value problem:

|-6w-1| = |-6w+5| Find the equation of a line passing through the points (3,6) and perpendicular to the line y=x+7