a) 10 months
b) 12 months
c) 14 months
d) None of these
Answer: d
Explanation: Suppose, Swati invested Rs. 5x for 7 months
Rajni invested Rs. 6x for y months
$$\eqalign{
& \frac{{5x \times 7}}{{6x \times y}} = \frac{5}{9} \cr
& 30y = 315 \cr
& y = 10\frac{1}{2} \cr} $$
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