Question

.In a class of 30 students, the average weight of boys is 20 kg and the average weight of girls is 25 kg. The fraction of boys out of the total students of the class isRequired to answer. Single choices.
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Answer 1

Answer:

Let us assume the number of boys = B and number of girls = G.

According to question,

B + G = 30

Lets us assume total weight of boys = W1 and total weight of girls = W2

average weight of boys = total weight of boys/number of boys

total weight of boys/number of boys = 20

W1/B = 20

W1 = 20B

average weight of girls = total weight of girls/number of girls

25 = W2/G

W2 = 25G

Data is not sufficient to solve the equation.

since we do not know either the average weight of the whole class or the ratio of no. of boys to girls.