Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions

A and B together can finish a piece of work in 12 days. If ‘A’ alone can finish the same work in 20days , in how many days B alone can finish it?



A and B take 12 days to complete the work.
⇒A and B's 1 day's work= \frac{1}{12}
A takes 20 days to complete the work.
⇒A's 1 day's work= \frac{1}{20}
⇒B's 1 day's work=  \frac{1}{12}- \frac{1}{20}
= \frac{1*5-1*3}{60}
= \frac{2}{60}= \frac{1}{30}
⇒B can do the work in  \frac{1}{ \frac{1}{3  0}} =30 days.
Ans:B alone will finish the work in 30 days.
Please mark as the best.
1 5 1
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts