Question

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.

Answer 1

let weight of rahim =weight of reshma=x
hence from given data
40+x+x/3=46
40+2x=46×3
2x=138-40
2x=98
hence x= rahim's weight=98/2=49

Answer 2

Answer:

Rahim's weight is 37 kg.

Step-by-step explanation:

Let the weight of Rahim is x. Then the weight of Reshma is also x since both have same weight.

Now, we know the formula for mean which is given by

$\text{mean}=\frac{\text{Sum of observations}}{\text{Total number of observation}}$

Sum of observations = 46+x+x=46+2x

Number of observations = 3

Mean = 40

Plugging these values, we get

$40=\frac{46+2x}{3}\\\\46+2x=120\\2x=74\\x=37$

Therefore, Rahim's weight is 37 kg.