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9. The mean (average) weight of three students is 40 kg. One of the students Ranga weighs46 kg. The other two students, Rahim and Reshma have the same weight. Find Rahimweight. |
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Answer» avg wt Of ranga+ rahim+reshma= 40total wt= 40×3= 120wt of ranga= 46wt of resham+ rahim = 120-46= 74resham=rahim= x(let)2x= 74x= 74/2=37 kgwt of resham= wt of rahim= 37 kg (46+X+X)÷3 = 4046+2X = 1202X = 74X = 37so Rahim weight is 37 kg Answer 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 40 = 46 + x + x/3=46 + 2x/3; 120 = 46 + 2x; 2x = 74; x = 74/2=37 don't know this itself |
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