Question

The average age of boys in the class is twice the number of girls in the class. If the ratio of the boys and girls in the class of 36 be 5 : 1 ,what is the total of the ages of the boys in the class

• A. 420 years
• B. 196 years
• C. 490 years
• D. 360 years

Answer 1

Answer: (D)

360 years

$5:1=(36-x):x\Rightarrow x=6$
number of boys = 30
number of girls = 6
average age of boys = 12 years
Required sum of ages
$=12\times 30$ years = $360$ years.