A, B and C can do a piece of work in 10, 20 and 30 days, respectively. In how many days can A do the work if he is assisted by B and C on every third day?
Answer & explanation
Correct answer: option 3
A = 10 days, B = 20 days, C = 30 days,
⇒ A starts the work and he is assisted by B and C on every third day,
1st day = 6 units,
2nd day = 6 units,
3rd day = 6 + 3 + 2 = 11 units
Every 3 days, 23 units are completed,
So, In 6 days, 46 units of work is completed,
and In 8 days, 58 units of work is completed,
Therefore, in \( {8 }_{11 }^{2 } \) days, 60 units will be completed.