A typist takes 40 minutes to type 4 pages. How many pages will he type in 90 minutes?
9
Find the typing rate in pages per minute.
Rate \(= \dfrac{4 \text{ pages}}{40 \text{ minutes}} = \dfrac{1}{10}\) page per minute.
Pages typed in 90 minutes \(= \dfrac{1}{10} \times 90 = 9\).
Hence, the typist will type 9 pages in 90 minutes.
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