a) Rs. 8000
b) Rs. 12000
c) Rs. 18000
d) Rs. 20000
Answer: a
Explanation: Initial ratio of investments by A and B = 2 : 3
Let their respective investments are 2x and 3x
If A added Rs. 10000 to his investment
Then the new ratio = 3 : 2
$$\eqalign{
& \frac{{2x + 10000}}{{3x}} = \frac{3}{2} \cr
& 4x + 20000 = 9x \cr
& 5x = 20000 \cr
& x = 4000 \cr} $$
Original investment by A = 2 × 4000 = Rs. 8000
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