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The average weight of 12 men decreases by 2 kg when one of them weighing 91 kg was replaced by a new man. Find the weight of the new man.
(x + y + z) / 3
Area of a square = side length squared (x+y)2 (x+y)(x+y) x2+xy+yx+y2 Area = x2+2xy+y2
12/25 = 2/y so y = 2*25/12 = 25/6 = 4.166... units.
The perimeter is the sum of its 4 sides and its area is length times width