The average age of 12 boys is 15 years and the average age of 18 girls is 12 years. What is the combined average of the boys and girls,taken together?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 13.2
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Understanding |
Application |
Calculation |
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Average age of 12 boys is 15 years |
Total age of boys = 180 |
⇒ 12 × 15 = 180 |
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Average age of 18 girls is 12 years |
Total age of girls = 216 |
⇒ 12 × 18 = 216 |
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Average age of the boys and girls is to be calculated. |
Total age of boys and girls = 396 |
⇒ 180 + 216 = 396 |
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Total number of boys and girls = 30 |
⇒ 12 + 18 = 30 |
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Average age of the boys and girls = 13.2 years |
⇒ 396/30 = 13.2 |