A is twice as good a workman as B and together they finish a piece of work in 14 days. In how many days will A alone finish the work?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 21 days
“Twice as good a workman” means A does twice as much work in a day as B, so the work can be counted in units done per day.
Let B do 1 unit a day; then A does 2 units a day, and together they do 3 units a day
Together they finish in 14 days, so the whole work \(=3\times14=42\) units
A alone takes \(42\div2=21\) days