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52=(50x50+5n)/55
52x55 = 50x50 + 5n
2860 = 2500 + 5n
5n = 360
n = 360/5 = 72 kg
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55 org
2500 + 5 x = 52 * 55
2500 + 5x = 2860
5x = 2860 -2500
x = 72