Question 1105550
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if 7 {{{highlight(cross(typist))}}} <U>typists</U> {{{highlight(cross(is))}}} typing 7 hours in a day at equal {{{highlight(rate)}}} take 9 days to type the manuscript of a book, 
then in how many days will 3 typists  working 3 hours in a day take to do the same job ?
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<pre>
The "typist hours" are the same in both cases, which gives you an equation


7*7*9 = 3*3*days,


Solve it for "days".


<U>Answer</U>.  49 days.
</pre>