Let respective weights of Somdev, Gurdeep and Ritu is $$s , g , r$$ kg Average weight of the three = $$frac{s + g + r}{3} = 85$$ => $$s + g + r = 85 imes 3 = 255$$ kg --------------(i) Similarly, Total weight of Somdev and Gurdeep = $$s + g = 79 imes 2 = 158$$ kg ---------------(ii) Total weight of Gurdeep and Ritu = $$g + r = 73 imes 2 = 146$$ kg -------------(iii) Adding equations(ii) and (iii), => $$s + 2g + r = 158 + 146 = 304$$ ---------------(iv) Subtracting equation (i) from (iv), we get : => $$g = 304 - 255 = 49$$ kg