exam Maths Puzzle Numerical Ability

3x+y=5
-2x+3y+4

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exam Other Question

For a sample of size n=60, proportion p=0.35, and 95% confidence level, the lower bound of the proportion is ______? 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?