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The average weight of 3 students P,Q and R is 84kg.Anothe students S joins the group and the average becomes 80kg. If another man T whose weight is 3kg more than that of S, replaces P, then the average weight of Q,R,S and T becomes 79 kg then the weight of P is:
75
82
45
98
P+Q+R = 84*3 = 252 P+Q+R+S = 4*80 = 320 S = 320 – 252 = 68 Q+R+S+T = 79*4 = 316 Q+R+2S+3 = 316 S =68, Q+R =177 P = 252 – 177 = 75
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