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A group of students volunteered to finish a cons
A group of students volunteered to finish a construction work in 25 days. 1Q of the students did not come and the work could be finished in 35 days. The original number of students in the group were
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* ** *** **** ** each ******** ***
construction
**** **** ******** in 25 ***** --> 25*a*b=1
***********
* ******** ***
***
****
***
the **** ***** ** finished in ** ***** -->35(a-Q)*b=1 ***************** **** ** ********** ab=1/25
****
***
equation
** (2)
35*(1/25)-35Qb=1
*********************************** ** substitute b=1/(25Q)-1/(35Q) **** *** ******** **
(1)
**
****
out
a
******************** **** ************************ ** a=7Q/2 **** a=7Q/2 ** *** original ****** **
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