Question

A,B andC can do a piece of work in 20,30 and 60 fays rrspectively.In how many days can A do the work if he is assisted​

Answer 1

Answer:

I don't understand rrispectivaly

Step-by-step explanation:

7

Answer 2

Answer:

Step-by-step explanation:

A's 2 days's work=(1/20)*2=1/10

A+B+C 's 1 day work=(1/20+1/30+1/60)=1/10

work done in 3 days=(1/10+1/10)=1/5

now 1/5 work done in 3 days

whole work=3*5=15 days