Question

The first group of 10 children has a mean weight of 16kg ,the second group of another 10 children has a mean weight of 16kg and the third group of children has a mean weight of 20. If the mean weight of the children is 17.5kg. Find the total number of chilren in all of the three groups.

Answer 1

Answer:32

Step-by-step explanation.

1 group = total wt/ no. of children =16

= total wt/10 =16

= total wt = 160

by similarl way we can find out 2nd group total wt = 160

3rd group = total wt/ no. of child = 20

let us take no. of children be x

then 3rd group total wt will be 20x

taking mean of all 3 groups

total wt of 3 group / total children = 17.5160+160+20x / 10 + 10 +x = 17.5

by solving this

x=12

total children = 10+10+12= 32

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Answer 2

Answer is 32

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