The length of a room exceeds its breadth by 3 metres. If the length is increased by 3 metres and the breadth is decreased by 2 metres, the area remains the same. Find the length and the breadth of the room.
Ans: length = 15 m, breadth = 12 m
Let the length and breadth of the room be l and b meters respectively.
According to question -
l - b = 3.....(1)
and,
lb = (l + 3)(b - 2)
⇒ lb = lb - 2l + 3b - 6
⇒ 2l - 3b = - 6.....(2)
Subtracting equation (2) from [3 × equation (1)], we get -
l = 15
Substituting the value of l in equation (1), we get -
b = 12
Thus, Length of room = 15 meters and breadth of room = 12 meters.