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Basic Mathematics QUESTION #2848
Question 1
A and B together can complete a piece of work in 6 days. A alone can do it in 10 days. In how many days can B alone complete it?
  • 12 days
  • 15 days✔️
  • 18 days
  • 20 days
Correct Answer Explanation
A and B together: \(\dfrac{1}{6}\) per day. A alone: \(\dfrac{1}{10}\) per day. B alone \(= \dfrac{1}{6} - \dfrac{1}{10} = \dfrac{5-3}{30} = \dfrac{2}{30} = \dfrac{1}{15}\). So B alone takes 15 days.