MCQ PracticeThe 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?Subject: MathematicsTopic: Basic MathsA15B9C18D21Correct Answer: BPractice QuizBack to MCQsRelated MCQsCurrent flows in a circuit whenEighttenths coulomb passes a point in 4 s. The current in amperes isThe unit of electrical charge is the