a) 11 : 17
b) 8 : 27
c) 5 : 9
d) 2 : 9
Answer: b
Explanation:
$$\eqalign{
& \frac{A}{D} = {\frac{A}{B}} \times {\frac{B}{C}} \times {\frac{C}{D}} \cr
& \,\,\,\,\,\,\,\,\, = {\frac{2}{3}} \times {\frac{4}{5}} \times {\frac{5}{9}} \cr
& \,\,\,\,\,\,\,\,\, = \frac{{ {2 \times 4 \times 5} }}{{ {3 \times 5 \times 9} }} \cr
& \,\,\,\,\,\,\,\,\, = \frac{8}{{27}} \cr
& \,\,\,\,\,\,\,\,\, = 8:27 \cr} $$
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