Question

Q7. The average weight of 5 boys is 46 kg and the average weight of 4 boys is 46.5 kg.
Find the weight of the fifth boy.​

Answer 1

$\small \: \sf\frac{ w_{1} + w_{2} + w_{3} + w_{4} + w_{5} }{5} = 46kg \\ \\ \sf \small \: w_{1} + w_{2} + w_{3}+ w_{4} +w_{5} = 230kg...(i) \\ \\ \small \sf\frac{w_{1} + w_{2} + w_{3} + w_{4} }{4} = 46.5kg \\ \\ \sf \: w_{1} + w_{2} + w_{3} + w_{4} = 186kg...(ii)$

So the change in weight = eq (i) - (ii)230kg - 180kg = 50kg.

Therefore the weight of the fifth boy is

• $\red{\boxed{\bf50kg}}$

I HOPE IT HELPS.

Answer 2

Answer:

The average weight of 5 boys is 46 kg (given)

The average weight of 4 boys is 46.5 kg (given )

The weight of the 5th boy = The average weight of 5 boys - The average of 4 boys

The average weight of 5th boy= 46-46.5

Step-by-step explanation:

The average weight of 5 boys is 46 kg (given)

The average weight of 4 boys is 46.5 kg (given )

The weight of the 5th boy = The average weight of 5 boys - The average of 4 boys

The average weight of 5th boy= 46-46.5