A) 10 cm
B) 20 cm
C) 25 cm
D) 75 cm
Correct Answer: C
Solution :
\[\frac{R}{S}=\frac{l}{100-l}\] \[\therefore \] \[\frac{5}{15}=\frac{l}{100-l}\] \[\Rightarrow \] \[5(100-l)=15l\] \[\Rightarrow \] \[500=15l+5l\] \[\Rightarrow \] \[l=\frac{500}{20}=25\,\,cm\].You need to login to perform this action.
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