a) 4 months
b) 5 months
c) 6 months
d) 8 months
Answer: d
Explanation:
$$\eqalign{
& {\text{Suppose B joined for }}x{\text{ months}} \cr
& \frac{{85000 \times 12}}{{42500 \times x}} = \frac{3}{1} \cr
& x = \frac{{85000 \times 12}}{{42500 \times 3}} \cr
& x = 8 \cr} $$
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