Question

A and B together can do a piece of work in 20 days, B and C together can do it in 15 days,
C and A together can do it in 12 days.
(i) How long will they take to finish the work, working all together?
(ii) How long would each take to do the same work?
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Answer 1

Answer:

a+b=20

b+c=15

c+a=12

Step-by-step explanation:

a=20-b