book Maths Puzzle Numerical Ability

k=9(k - 10)

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book Other Question

How do you solve |4x-3|=|9x+5|? The Flicks Video Store bought several VCRs.
Each recorder cost them $220.
They gave away one recorder in a prize drawing, and sold the others for $290 each.
Their profit was $1250.
How many recorders did they sell?