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20 April, 20:12

If the first chapter of a certain book is 40 pages long and makes up 20% of the book, how many pages does the entire book have?

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  1. 20 April, 21:17
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    200

    Step-by-step explanation:

    20% of a book = 40 pages

    100% of a book = x pages

    20/100 = 40/x Cross multiply

    20x = 100*40 Combine the right

    20x = 4000 Divide by 20

    20x/20 = 4000/20 Do the division

    x = 200 Answer
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