the average age of 3 boys is 120 years and their ages are in proportion 2 : 6 : 8 . what is the age in years of the youngest boy ?
2 x + 6 x + 8 x = 120 x = 7.5 2 x = 15 answer : c
multiply(divide(120, add(add(2, 6), 8)), 2)