a) $$\frac{1}{6}$$
b) $$\frac{1}{9}$$
c) $$\frac{2}{5}$$
d) $$\frac{2}{7}$$
Answer: a
Explanation:
$$\eqalign{
& {\text{A’s 1 day’s work}} = \frac{1}{{18}} \cr
& {\text{B’s 1 day’s work}} = \frac{1}{9} \cr
& \left( {{\text{A}} + {\text{B}}} \right)'{\text{s 1 day’s work}} \cr
& = \left( {\frac{1}{{18}} + \frac{1}{9}} \right) \cr
& = \frac{1}{6} \cr} $$
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