The average age of three boys is 15 years and their ages are in proportion 3:5:7. What is the age in years of the youngest boy? February 9, 2023 – by admin 0 The average age of three boys is 15 years and their ages are in proportion 3:5:7. What is the age in years of the youngest boy? a. 15 b. 9 c. 18 d. 21
