A) 3 months
B) 4 months
C) 5 months
D) 7 months
Correct Answer: A
Solution :
[a] Let the investments of A and B be Rs. 12x and Rs. 11x, respectively. Suppose B invested the money for y months. Then, \[A:B=(12x\times 11):(11x\times y)\] \[=(132x:11xy)=12:y)\] \[\therefore \] \[\frac{12}{y}=\frac{4}{1}\]\[\Rightarrow \]\[4y=12\]\[\Rightarrow \]\[y=3\] Hence, B invested the money for 3 months. |
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