Question

the mean (average) of three boys is 40 pounds. one of the boyd weighs 50 pounds. the other two boys have the same weight. find weight of each of the boys

Answer 1

35

Explanation:

let us take each boy's weight as x

therefore,

average =
`(x+x+50)/(3\\)`

40 =
`(x+x+50)/(3\\)`

40 x 3 = x + x + 50

120 - 50 = 2x

70 = 2x

2x = 70

x =
`(70)/(2)`

x = 35

So weight of each boys is 35.

Answer 2

35, 35, and 50

Explanation:

50 + x + x = n

n ÷ 3 = 40

n = 40 x 3

n = 120

50 + 2x = n

50 + 2x = 120

2x = 120 - 50

2x = 70

2x/2 = 70/2

x = 35

To check:

35 + 35 + 50 = 120

120 ÷ 3 = 40

Hope this helps