Area of four walls of a room is 99 m2. The length and breadth of the room are 7.5 m and 3.5m respectively. The height of the room is:
Select:
A) 2.5m B) 3.5m C) 1.5m D) 4.5m E) 5.5m
2(7.5+3.5)×h = 99   2(11)h = 99   22h = 99   h = 99/22 = 9/2= 
<gadget id="calculator">9/2</gadget>
<output>9/2 = around 4.5</output>
4.5 m   Answer is 4.5m.
<result>D</result>
Area of four walls of a room is 99 m2. The length and breadth of the room are 7.5 m and 3.5m respectively. The height of the room is: