Simple Equations Exercise: There were 36,000 hardback copies of a certain

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There were 36,000 hardback copies of a certain novel sold before the paperback version was issued. From the time the first paperback copy was sold until the last copy of the...

Solution

Initially the number of hardcopies of a novel sold = 36,000Let the number of hardcopies sold from the time the first paperback version were issued be = NGiven, 9 times as many paperback copies as hardback copies...