Question : A is twice as good a workman as B and together they complete a task in 13 days. In how many days will B alone complete the task?
Option 1: 39
Option 2: 42
Option 3: 21
Option 4: 18.5
Correct Answer: 39
Solution : Let B's efficiency be $x$. A's efficiency = $2x$ Work done by A and B together in 13 days = 1 Work done by A and B together in 1 day = $\frac{1}{13}$ Work done by A in 1 day + Work done by B in 1 day = $\frac{1}{13}$ ⇒ $2x+x=\frac{1}{13}$ ⇒ $3x=\frac{1}{13}$ ⇒ $x=\frac{1}{39}$ Work done by B in 1 day $=\frac{1}{39}$ Therefore, the work is completed by B in 39 days Hence, the correct answer is 39.
Result | Eligibility | Application | Selection Process | Cutoff | Admit Card | Preparation Tips
Question : A is twice as good a workman as B, and together they finish a piece of work in 13 days. In how many days will A alone finish the work?
Question : P and Q can do a piece of work in 14 days. Q and R together can do it in 21 days. If P is twice as good a workman as R, then in how many days Q alone can do the work?
Question : A is twice as good a workman as B and B is twice as good a workman as C. If A and B can together finish a piece of work in 4 days, then C can do it by himself in:
Question : A is twice as efficient as B and C is thrice as efficient as B. Working together, they can finish a certain work in 5 days. A and C worked together for 5 days. B alone would complete the remaining work in ____.
Question : One man and one woman together can complete a piece of work in 8 days. A man alone can complete the work in 10 days. In how many days can one woman alone complete the work?
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile