Question
Alipta got some amount of money from her father. In how many years will the ratio of the money and the interest obtained from it be 10 : 3 at 6% simple interest per annum ?
Answer: Option C
$$\eqalign{
& {\text{Let principal and SI is}} \cr
& {\text{ = }}10x,{\text{ }}3x{\text{ }} \cr
& {\text{and time is = }}t \cr
& \Rightarrow 3x = \frac{{10x \times 6 \times t}}{{100}} \cr
& \Rightarrow t = 5\,{\text{years}} \cr} $$
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$$\eqalign{
& {\text{Let principal and SI is}} \cr
& {\text{ = }}10x,{\text{ }}3x{\text{ }} \cr
& {\text{and time is = }}t \cr
& \Rightarrow 3x = \frac{{10x \times 6 \times t}}{{100}} \cr
& \Rightarrow t = 5\,{\text{years}} \cr} $$
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