80% of Lance = 75% of Lennie → \( \frac{4}{5} L_a = \frac{3}{4} L_e \).

• \( \frac{L_a}{L_e} = \frac{\frac{3}{4}}{\frac{4}{5}} = \frac{3}{4} \times \frac{5}{4} = \frac{15}{16} \)
• So Lance : Lennie = 15 : 16
• Difference = Lennie − Lance = 16 − 15 = 1 part
• Lance : Difference = 15 : 1

Final Answer: 15 : 1