a) 5
b) $$5\frac{1}{2}$$
c) 6
d) 8
Answer: c
Explanation:
$$\eqalign{
& {\text{B’s}}\,{\text{10}}\,{\text{day’s}}\,{\text{work}} \cr
& = {\frac{1}{{15}} \times 10} = \frac{2}{3} \cr
& {\text{Remaining}}\,{\text{work}} \cr
& = {1 – \frac{2}{3}} = \frac{1}{3} \cr
& \frac{1}{{18}}{\text{work}}\,{\text{is}}\,{\text{done}}\,{\text{by}}\,{\text{A}}\,{\text{in}}\,{\text{1}}\,{\text{day}} \cr
& \frac{1}{3}\,{\text{work}}\,{\text{is}}\,{\text{done}}\,{\text{by}}\,{\text{A}}\,{\text{in}} \cr
& {18 \times \frac{1}{3}} = 6\,{\text{days}} \cr} $$
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