3. A can do a piece of work in 20 days and B can do it in 30 days. How long will they
take to do the work together?
Answers
Answered by
0
Answer:
maybe 10 days I thought
Answered by
1
Answer:
A : 20days per work
ie, (1/20) work per day
B : 30days per work
ie, (1/30) work per day
A+B: (1/20) + (1/30) work per day
= (1/12) work per day
ie, 12 days per work
so A and B together can do the work in 12 days
Similar questions