a contractor undertook a contract to complete a part of a stadium in 9 months with a team of 560 persons.later on, it was required to complete the job in 5 months .how many extra persons should he employ to complete the work?

Less months = More people required. Therefore, we use inverse variation.  X (months) = 9         Y (people) = 560                    New :-            X (months) = 5 months              Y (people) = ?                  
     in Inverse Variation,   k = xy   
    9* 560 = 5y    
y = 9 * 560/ 5 = 9 *112 = 1008           Therefore, 1008 - 560 = 432 extra people are required!
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432
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Less months = More people required. Therefore, we use inverse variation. X (months) = 9 Y (people) = 560 New :- X (months) = 5 months Y (people) = ? in Inverse Variation, k = xy 9* 560 = 5y y = 9 * 560/ 5 = 9 *112 = 1008 Therefore, 1008 - 560 = 448 extra people are required!
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1008-560 is not equal to 432 xD. it is 448. 
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