a) 3 days
b) 4 days
c) $${\text{4}}\frac{1}{2}$$ days
d) 5 days
Answer: c
Explanation: Number of pairs knit by A and B together in 1 day
$$\eqalign{
& = \left( {\frac{1}{3} + \frac{1}{9}} \right) \cr
& = \frac{4}{9}{\text{ }} \cr} $$
Required number of days,
$$\eqalign{
& = \left( {2 \div \frac{4}{9}} \right) \cr
& = \left( {2 \times \frac{9}{4}} \right) \cr
& = \frac{9}{2} \cr
& = 4\frac{1}{2} \text{ days} \cr} $$
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