ABC26GN1572 · Average

Subject: General Aptitude · Chapter: Average · Exam: 2009 · Marks: · Difficulty:

In a class there are 32 boys and 28 girls. The average age of the boys in the class is 14 years and the average age of the girls in the class is 13 years. What is the average age of the whole class (rounded to two digits after decimal)?

(a)12.51

(b)13.42

(c)13.50

(d)13.53

(e)None of these

Answer

Answer (as printed): D

Explanation

$$\begin{aligned} \text { Required average } & =\left(\frac{32 \times 14+28 \times 13}{32+28}\right)=\left(\frac{448+364}{60}\right)=\frac{812}{60} \\ & =13.53 \end{aligned}$$

Explanation as extracted from the printed page; notation may be imperfect.

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