A book has 70 pages with 30 lines of printed matter on each page. If each page is to have only 20 lines of printed matter, how many pages will the book have?
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It is a case of inverse variation.
So,
= 70×30=20x
= x= 70×30÷20
= x= 2100÷20
= x= 105 pages
So,
= 70×30=20x
= x= 70×30÷20
= x= 2100÷20
= x= 105 pages
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