Given: Ratio of numbers = 5 ∶ 8 Their difference = 48 Concept used: Using the concept of ratio Calculation: Let the numbers are 5x and 8x. According to the question, 8x−5x=48 ⇒3x=48 ⇒x=16 Smaller number = 5x ⇒ Smaller number = 80 ∴ The smaller number is 80.