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Q.

The average age of 20 students is 15 years and the average age of another 10 students is 12 years. Find the average age of total students.

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a

15 yrs

b

13 yrs

c

12 yrs

d

14 yrs

answer is D.

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Detailed Solution

Sum of 20 students = 15 × 20 = 300

sum of 10 students = 10 × 12 = 120

$T o t a l a v e r a g e = \frac{300 + 120}{30}$

$= \frac{420}{30}$

= 14 years

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