Question

(x-5) person can do a work in x days and (x+5) person can do 75 % of the same work in (x-11) days. Then in how many days can (x+10) person finish the work? * a. 15 days b.10 days c.20 days d. 24 days​

Answer 1

Answer:

Answer:   12 days

Explanation:

34×(x−2)x=(x+7)(x−10)34×(x-2)x=(x+7)(x-10)

⇒x2−6x−280 =0⇒x2-6x-280 =0 

=> x= 20   and   x=-14

 so, the acceptable values is x=20 

Therefore, Total work =(x-2)x = 18 x 20 =360 unit

 Now   360 = 30 x k         

=> k=12 days