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### Question

There are three sections in school with 20, 40 and 40 students respectively. The average weight of a student in these sections, respectively, is 6, 2 and 4 Kg. What is the average weight of all the the students of the combined sections?

**A**

$3{3/5}$.

**B**

$3{61/100}$.

**C**

$3{59/100}$.

**D**

$3{29/50}$.

**Soln.**

**Ans: a**

The sums of the weights of all the students is 20 × 6 + 40 × 2 + 40 × 4 = 360. The required average = 360/total students = $360/{20 + 40 + 40}$ = ${18/5}$, which is same as: $3{3/5}$.