Average weight formula: Sum of weights = Average weight × Number of people Calculations: The average weight of Gopal, Akshay and Atul =46kg The average weight of Gopal and Akshay =40kg The average weight of Akshay and Atul =45kg Formula used: Average = Sum of all observations/Number of observation Calculation: Sum of the weight Gopal, Akshay and Atul ⇒ Gopal + Akshay + Atul =46×3=138kg ⇒ Gopal + Akshay =40×2=80kg ⇒ Akshay + Atul =45×2=90kg Subtract equation 1 from addition of equation 2 and 3 ⇒( Gopal +2 Akshay + Atul )−( Gopal + Akshay + Atul )=80+90−138 ⇒ Akshay = 32 kg