Question

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?

Answer 1

200

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