Question

4. A can do a piece of work in 20 days while B can do it in 15 days. With the help of C, they finish
the work in 5 days. In what time would C alone do it?
Lit in 16 days​

Answer 1

Answer:

12 days

Step-by-step explanation:

Solved using LCM method

A =20

B= 15

A+B+C = 5

LCM(20,15,5) = 60

efficiency of A = 60/20 = 3

efficiency of B = 60/15 =  4

efficiency of A+B+C = 60/5 = 12

3+4+C=12

efficiency of C = 5

so C alone can do it in  60/5 = 12 days