12. IfA and B can do a certain work in 6 days and B also can do it in 15 days, how
many days will a take to do the work alone ?
(a) 10 days (b) 8 days (c) 9 days (d) 12 days
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Answer:
answer is (a)10 days
A+B=6days- 5work in 1 day
|-30《
B=15days- 2work in 1 day
A+B-B= 5- 2= 3
HENCE ,A takes 30÷3= 10 days
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