Question

20. A and B working separately can do a
piece of work in 9 and 15 days,
respectively. If they work for a day
alternately, with B beginning, then the
work will be completed in ?
(a) 10 days
(b) 11 days
(c) 12 days
(d) 13 days
​

Answer 1

Answer:

l think the option is B

if not then tell me what have l done wrong

also follow me