A can do a piece of work in 4 days. B can do a piece of work in 12 days . In how many days can both do it together
1)1.5Days
2)2Days
3)3Days
4)2.5Days
[Please Explain By Process]
Answers
Answer:
First find how much work A and B can do power day.
A can do 1/3/5 =1/15 of the work per day
B can do 2/5/10=2/50=1/25 of the work per day.
A and B can do (1/15)+(1/25) work per day.
= 8/75 of the per day
Days needed for then to complete the work = 75/8 (as 8/75 and 75/8 multiplied will get 1, that is, the whole task)
Number of days needed= 75/8 = 9.375 days ≈ 10 days. (As the number of days should be a whole number)
Answer:
A can do 1 part of work in 4 days
In 1 day he can do 1/4 part work
B can do a work in 12 days
In 1 day he can do 1/12 part
In 1 day they togather can do 1/4 + 1/12 part = 4/12 = 1/3 part
They can complete 1/3 part in 1 day
they can complete 1 part of work in (1÷1/3) day = 1×3 = 3 days
They can complete the work in 3 days togather