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