A) 80 cm
B) 70 cm
C) 90 cm
D) 75 cm
Correct Answer: A
Solution :
Error = x%, Gain% \[=\frac{\text{Error}}{\text{True}\,\,\text{value}-\text{Error}}\times 100\] \[\Rightarrow \,\,\] \[25=\frac{x}{100-x}\times 100\] \[\Rightarrow \,\,\] \[100-x=4x\Rightarrow \,\,5x=100\] \[\Rightarrow \] \[x=20\] \[\therefore \]Scale used \[=100-20=80\,\,\text{cm}\]You need to login to perform this action.
You will be redirected in
3 sec