Question

Answer this fast please...
Ques No. 8
Pls fast..

Answer 1

Answer:

x=140 & y= 280

Step-by-step explanation:

• let the time taken by man be x days and time taken by boys be y days
• work by 1man in one day =1/x and by boys =1/y
• as per sum

8/x +12/y =1/10 ----------(1)

again

6/x+8/y =1/4 -------------(2)

let the 1/x=u and 1/y= v

8u+12v=1/10

6u + 8v = 1/14

×ing eq (1) by 2 and eq (2) by3

16u + 24v=2/10 ------(3)

18u+24 v =3/14

gives -2u = -3/14 +2/10

u=1/140

take u and substitute in eq (3)

v=1/280

u=1/x v=1/280

1/140 =1/x 1/y=1/280

x= 140 y=280

hope tgis will help u :-)