a) $${\text{4}}\frac{2}{5}{\text{ days}}$$
b) $${\text{5}}\frac{1}{3}{\text{ days}}$$
c) $${\text{6 days}}$$
d) $${\text{12 days}}$$
Answer: b
Explanation: Ayesha’s 1 day’s work $$ = \frac{1}{{16}}$$
Amita’s 1 day’s work $$ = \frac{1}{{8}}$$
(Ayesha + Amitha)’s 1 day’s work
$$\eqalign{
& = {\frac{1}{{16}} + \frac{1}{8}} \cr
& = \frac{3}{{16}} \cr} $$
Both together can complete the work in
$$\eqalign{
& = \frac{{16}}{3} \cr
& = 5\frac{1}{3}{\text{ days}} \cr} $$
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