Q9 of 40 Page 210

The mean (average) weight of three students is 40 kg. One of the students Ranga weighs 46 kg. The other two students, Rahim and Reshma have the same weight. Find Rahims weight.

Given: Mean of three students = 40 kg

The three students are Ranga, Rahim and Reshma, where


Ranga’s weight = 46 kg


Let Rahim’s weight = x


And Reshma’s weight = y [∵, Rahim’s weight = Reshma’s weight, according to the question]


Mean is given by



⇒ [∵, Mean = 40]


⇒ 120 = 46 + 2x


⇒ 2x = 120 – 46 = 74


⇒ x = 74/2


⇒ x = 37


Thus, Rahim’s weight = 37 kg


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