Question

A and B do a piece of work in 12 days B and C in 15 days and A and C in 20 days. in how many days ​

Answer 1

Answer:

write whole questions

Answer 2

Answer:

10

Step-by-step explanation:

he wants to ask how much time it will take to all of them to complete the work.

Solution:

LCM OF 12,15,20 is 60.

now calculate effieciency of 1 day,

60/12=5, 60/15=4, 60/20=3

so,    

            A + B =5

            B + C =4

             C + A=3

 ----------------------------

  2(A+B+C) = 12

  efficiency of all = 12/2=6;

Time to complete work when all together is =60 /6 =10 days