A rectangular room is 2 times as long as it is wide, and its perimeter is 42 meters. Find the dimension of the room.
The length is:
The width is:
Let x be the width of the room.
The length of the room is then 2x.
The perimeter of the room is 2*(2x+x)=42.
Simplifying the equation, we get 6x=42.
Dividing both sides of the equation by 6, we get x=7.
So, the width of the room is 7 meters and the length of the room is 2*7=14 meters.