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eduard
3 years ago
5

A secretary can type 12 pages per hour. There are a total of 152 pages to type. How many pages remain to be typed after 9 hours?

Mathematics
1 answer:
mr_godi [17]3 years ago
4 0
So, she can type 12 pages in 1 hour, how many would she type in 9 hours then?  let's check,

\bf \begin{array}{ccll}
pages&hours\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
12&1\\
p&9
\end{array}\implies \cfrac{12}{p}=\cfrac{1}{9}\implies \cfrac{12\cdot 9}{1}=p

so in 9 hours, she has that typed that many pages, how many pages remain from the 152?  well 152 - p.
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