A) \[15\,\,m\]
B) \[22.5\,\,m\]
C) \[25\,\,m\]
D) \[30\,\,m\]
Correct Answer: D
Solution :
Let the breadth of rectangular hall\[=x\,\,m\]. \[\therefore \] length\[=(x+5)\,\,m\]. Area of hall = length \[\times \] breadth \[750=(x+5)x\] \[\Rightarrow \] \[{{x}^{2}}+5x-750=0\] \[\Rightarrow \] \[{{x}^{2}}+30x-25x-750=0\] \[\Rightarrow \] \[x(x+30)-25(x+30)=0\] \[\Rightarrow \] \[(x-25)(x+30)=0\] \[\Rightarrow \] \[x=25,\]as\[x\]cannot be negative. \[\therefore \] Length of hall\[=x+5\] \[=25+5=30\,\,m\].You need to login to perform this action.
You will be redirected in
3 sec