Question

The average age of boys in the class is twice the number of girls in the class. The ratio of boys and girls in the class of 50 is 4 : 1. The total of the ages (in years) of the boys in the class is 

विकल्प

• 2000

• 2500

• 800

• 400

Answer 1

800

Explanation:

Boy	:	Girl	......`[( : 5 - 50),( : 1 - 10)]`
4	:	1
40 boys		Girls

∴ Total age = 40 × 2 × 10 = 800 years.