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swati chaudhary

· started a discussion

· 1 Months ago

explain (Question: 189944.0 )

why have you take 120 ? explain it again

Question:
A is 50% as efficient as B. C does half of the work done by A and B together. If C alone does the work in 20 days, then A, B and C together can do the work in –
Options:
A) 5 \(\cfrac{2}{3}\) days 
B) 6 \(\cfrac{2}{3}\) days 
C) 6 days 
D) 7 days 
Solution:
Ans: (b) 

C takes 20 days

A & B will take 10 days ( Given)

A + B + C = 1/10 + 1/20 = 3/20 ( 1 day work)

total days=  20/3=6.66 days

Knowledge Expert

· commented

· 1 Months ago

See the Shortest way:

C takes 20 days
A & B will take 10 days ( Given)
A + B + C = 1/10 + 1/20 = 3/20 ( 1 day work)
total days= 20/3=6.66 days
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