Question

A and B can together finish a work in 30 days. B and C in 24 days ; C and A in 40 days. How long will it take them to do the work together

Answer 1

Answer:

20 days

Step-by-step explanation:

A+B=30

B+C=24

C+A=40

A+B+C=20

Answer 2

Answer:

47

Step-by-step explanation:

we have given that:

a+b=30;b=30-a

b+c=24;

c+a=40c=40-a

so,

b+c=24        ,30-a+40-a=24

a=23

b=30-23=7

c=40-23=17

than,a+b+c=47