Question

A+B ,B+C,C+A can do a work in 20days , 30days and 40 days respectively in how much time they alone do the work?​

Answer 1

Answer:

A+B= 20

B+C=30

C+A=40

now A+B=20

SO B= 20-A

B+C=30

SO,20-A+C=30

C-A=10

AND C+A=40

         C-A=10

HERE 2C=50

C= 25

WE KNOW ,            C-A = 10

                    25-A= 10

                 A= 25-10

      A= 15

AND ,             A+B= 20

                 B= 20-A

                 B= 20 - 15

        B=5

HOPE IT WILL HELP U DEAR