Question

a book has 400 pages .each page has 120 words prited on it . how many pages will be required to print the same book with 150 words a page ?

Answer 1

Book has 400 pages, words on each page = 120
Total words = 400*120 = 48000 words
If per page is 150 then page required = 48000/150 = 320 pages


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Answer 2

$400 \times 120 = 48000 \\ 48000 \times 150 = 7200000 \\ 7200000 \: pages \: are \: in \: the \: same \: book$