A, B and C can finish a piece of work in 16days, 20days and 24days respectively. they started working together. how many days before b should leave the work so that work must complete in 7days?pls. Solve it...
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A. B. C. TW
16. 20. 24. 240
efficiency 15. 12. 10
total work done by 7 days
if B work X day
(A+B+c)x + (A+C)(7-x)=240
(15+12+10)x + (15+10)(7-x)=240
37x + 25(7-x)=240
37x+175-25x=240
12x=65
X=65/12
b leaves 7-65/12
19/12
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