Question

A, B and c doing a work in 3days, 9days and 15 days. how many days together finish the work?​

Answer 1

Answer:Hello. This is question of work and time.

Step-by-step explanation:1. Work efficiency is inversely proportional to the time taken to complete that work.

for example A makes two benches per day then its efficiency will be 1/2.or the part of work done in one day.then we can make a table as

Person  days  work-efficiency

A               3            1/3

B                9            1/9

C                15           1/15

since three works together ,there work efficiencies will add up.

Wnet=(1/3)+(1/9)+(1/15) =(15+5+3)/45=23/45

since work-efficiency and time are inversely proportional so they will finish work in 45/23 days.

Hope that is helpful.