A can do a work in 8 days and B in 12 days. They work together for 3 days. What part of the work is left?
\(\dfrac{3}{8}\)
Step 1 – Individual rates of work (per day):
\(\text{A's rate} = \dfrac{1}{8}, \quad \text{B's rate} = \dfrac{1}{12}\)
Step 2 – Combined rate per day:
\(\dfrac{1}{8} + \dfrac{1}{12} = \dfrac{3 + 2}{24} = \dfrac{5}{24}\)
Step 3 – Work completed in 3 days together:
\(3 \times \dfrac{5}{24} = \dfrac{15}{24} = \dfrac{5}{8}\)
Step 4 – Work remaining:
\(1 - \dfrac{5}{8} = \dfrac{3}{8}\)
Hence the part of work left is \(\dfrac{3}{8}\).
Similar Questions
A and B can complete a task together in 12 days, while B and C can finish it in 16 days. After A works on it for 5 days and B for 7 days, C takes the remaining 13 days to finish the work. How many days would it take for C to complete the work alone?
A is three times more efficient as a worker than B, which allows A to complete a job in 60 days less than B. If they work together, they can finish the job in:
- A contractor employs 15 men to complete a work in 24 days, working 8 hours per day. After six days, he adds five more men but also reduces the working hours to six per day from the seventh day onwards. If all men work with the same efficiency throughout, how many more days will be required to finish the remaining work?
- 6 women and 4 men can complete a work in 10 days, while 4 women and 5 men complete it in 10 days. In how many days will 8 women complete it?
A and B can finish a certain job in 28 and 35 days, respectively. They started working together, but A left after a while, and B managed to complete the remaining work in 17 days. How many days did A work before leaving?
- 20 men can do a piece of work in 45 days. Find the percentage amount of work done by 60 men in 6 days.
- Lalit can finish a work in $15\text{ days}$. Laxman can finish the same work in $25\text{ days}$. They work together for $5\text{ days}$. If the rest of the work is finished by Lalit and Deven in $4\text{ days}$, then in how many days can Deven alone finish the work?
- Athar can do a certain work in the same time in which Baban and Chetan together can do it. If Athar and Baban together could do it in 10 days and Chetan alone in 50 days, then Baban alone could do it in:
- If 10 men or 15 women can complete a work in 170 days, how long will 20 men and 20 women take for completing the same work?
If 6 machines complete a task in 10 days, how many days for 15 machines at the same rate?
Important Questions from Time and Work
Mohan can do a piece of work in 10 days and Sohan in 15 days. They started working together, but after 3 days Mohan left the work . What time will Sohan take to finish the work?
A tank is filled in 8 hours by three taps A, B and C. The tap C is thrice as fast as B and B is twice as fast as A. How much time will pipe B alone take to fill the tank?
Had been one menless, then the number of days required to do a piece of work would have been one more. If the number of Man. Days required to complete the work is 56, how many workers were there?
A can do a piece of work in 16 hours, B and C can do it in 8 hours while A and C can do it 12 hours. How long will B alone take to do it?
- lf 12 men can do a work in 20 days, in how many days will the work be done by 15 men-
