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### Question

There are three sections in school with 20, 40 and 30 students respectively. The average weight of a student in these sections, respectively, is 2, 5 and 2 Kg. What is the average weight of all the the students of the combined sections?

**A**

$3{1/3}$.

**B**

$3{31/90}$.

**C**

$3{29/90}$.

**D**

$3{14/45}$.

**Soln.**

**Ans: a**

The sums of the weights of all the students is 20 × 2 + 40 × 5 + 30 × 2 = 300. The required average = 300/total students = $300/{20 + 40 + 30}$ = ${10/3}$, which is same as: $3{1/3}$.