Question

John,David and Raheel have an average of 68 marbles each.David has 55 marbles and Raheel as 78 marbles.How many marbles does John have?

Answer 1

Answer:

We know that,

Average = Sum of all observations

----------------------------------

Number of observation

IT IS GIVEN THAT

Total number of observation=3

as there are only 3 children

No. of marbles with

David=55

Raheel=78

John=x

Average=68

Substituting values

we get,

68=(78+55+x)/3

204=133+x

x=71

Therefore John has 71 marbles.

PLEASE MARK IT AS BRAINLIEST.

Answer 2

Answer:

AVERAGE NUMBER = 55 + 78 + X / 3

X ( no of marbles John have)

AVERAGE NUMBER = 68

68 = 55 + 78 + X / 3

68 * 3 = 133 + X

204 = 133 + X

204 - 133 = X

71 = X

THEREFORE, JOHN HAVE 71 MARBLES.

HOPE IT HELPS