A and B together can do a work in 6 days. If A alone can do it in 15 days. In how many days can B alone do it?  Choose the most appropriate option.
A) 10
B) 99
C) 88
D) 66
E) 12
1/6 – 1/15 = 1/10 =&gt; 10   10nswer:10
<result>A</result>
A and B together can do a work in 6 days. If A alone can do it in 15 days. In how many days can B alone do it?