A, b and c can do a piece of work in 24 days, 30 days and 40 days respectively. They began the work together but c left 4 days before the completion of the work. In how many days was the work completed? Select one:
a. 11 days
b. 14 days
c. 13 days
d. 12 days
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Answer
a. 11 days
Step-by-step explanation:
time work. efficiency
24. 5
30. 120. 4
40. 3
-------------------------
12 = total efficiency
Let the work was completed in x days, then :
12(x-4) + 4*9 = 120
12x - 48 + 36 = 120
12x = 132
x = 11
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