Question

the average weight of a group of boys and girls is 38kg. the average weight of boys is 42kg and that of girl is 33kg.if number of boys is 25 than the number of girls is

Answer 1

Answer:

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Answer 2

Concept Introduction:

Data are summed up to determine the number of units in a list and then divided by that number.

Given: the average weight of a group of boys and girls is $38kg$. the average weight of boys is $42kg$ and that of girl is $33kg$.

To Find: if number of boys is $25$ than  the number of girls is ?

Solution: Let, X be the number of girl.

$(42 * 25) + (33 * X)/25 + X = 38.$

$1050 + 33X = 38(25 + X).$

$1050 - 950 = 38X - 33X.$

$100 = 5X.$

$X = 20.$