Question

A and B together can do a piece of work in 12 days B and C can do it in 20 days while Cand A can do it in
15 days. A, B and C all working together can do it in: ​

Answer 1

Answer:

SELECT TO BRAINLIST ANSWER.....

Answer 2

Question =》

A and B together can do a piece of work in 12 days B and C can do it in 20 days while Cand A can do it in

15 days. A, B and C all working together can do it in

Given=》

A+B=12days

B+C=20days

C+A=15days

Solution =》

A+B=12

Both do =

$\frac{1}{12}$

Similarly:-

B+C= 1/20

C+A= 1/15

Now adding above equation.

A+B+B+C+C+A=1/12+1/20+1/15

$2(a \: + b + c) = \frac{1}{12} + \frac{1}{20} + \frac{1}{15} \\ = 2(a + b + c) = \frac{5 + 3 + 4}{60} \\ = (a + b + c) = \frac{12}{120} \\ = (a + b + c) = \frac{1}{10}$

Hence, They all work in

10 days to complete : )