Question

if a person is doing the work in 20 days and another is doing the work in in 30 days how many day it will take if both will do the work. ​

Answer 1

Answer:

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Answer 2

Answer:

A can complete the work in 30 days, thus in one day A can do = 1/30th part of work

B can do this work in 20 days, thus in one day B can do =1/20th part of work

Both A and B work together then they can do part of work

1/30 + 1/20

(2 + 3)/60

= 5/60 part of work

Or 1/12 part of work

If they work together then they can complete the work early. Let they take x days to complete the entire work

1/12 × x days = 1

x/12 = 1

Cross multiplication

x = 1 × 12

x = 12 days

It suggest, that if both A and B work together then they can complete the entire work in 12 days.

Answer: if both A and B complete work in 12 days