Question

. A contractor takes a contract to construct
bridge in 6 months and employed 120 men
Due to some emergency, he was asked to
complete the job in 4 months. How many
more men should he put in for the job?​

Answer 1

Answer:

80men

Step-by-step explanation:

6months=120men

4 months =?

cross multiplication, 4 X 120 = 4 X 20= 80

                                    6

Answer 2

Answer:

180

Step-by-step explanation:

Inverse proportion method:

If 120 people can do a job in 6 months then

how many people cn altogether do the job in 4 months

(No of people to complete the job in 6 months)x(Total time)

=(No of people to complete the job in 4 months)x( Total time)

let the number of to complete the job in 4 months be 'a'

120 x 6 = 4a

a= (120 x 6)÷4

so a = 180

finally the number of people to complete the job in 4 months are 180

Extra knowledge : The person will have to hire

(180 - 120= 60) people to complete the work in 4 months