Question

A can do 1/5 th of a certain work in 2 days and Bcan do 2/3 Rd of it in 8 days . in how much time can they together complete the work

Answer 1

Answer:

let us consider totla work as 120 units

A for 2 days 1/5th of work i.e., 1/5(120) = 22

So A per day can do 22/2 = 11 units of work

B  for 8 days 2/3th of work i.e., 2/3(120) = 80

So B per day can do 80/8 =10 units of work

so for one day they together can complete 10+11 units = 21 units of work

1 day -> 21 units

x days ->120 units

x = 120/21 = 5 5/7 days(mixed fraction)

Step-by-step explanation: