Question

A, B and C can do a work in 90, 30 and 45 days respectively. If they work together, in how many days will they complete the 50% of work?
Select one:
a. 20
b. 10
c. 15
d. 15/2

Answer 1

Answer:

A's 2 day's work =(1/20x2)=1/10 .

(A + B + C)'s 1 day's work =(1/20+1/30+1/60)=6/60=1/10 .

Work was done in 3 days = 1/10+1/10=1/5.

Now,1/5work is done in 3 days.

therefore,  Whole work will be done in (3 x 5) = 15 days.

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