exam Maths Puzzle Numerical Ability

I each dimension of room is increased one meter, the area is increased by 51 meters; and if the length is increased one meter and the width diminished by one meter, the area is decreased three square meters. Find the dimensions of the room?

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exam Other Question
3x+y=5
-2x+3y+4 If the two given equations are being solved so that one unknown is eliminated by the method of comparison, which step is esential in the following problem.
3x+2y=7
6x-5y=8