Sharad is 60 years old and Santosh is 80 years ol4⃣ How many years ago was the ratio of their ages 4 : 6

A) 10 years B) 15 years C) 20 years D) How many years ago was the ratio of their ages 4 : 6? 1⃣ 10 years 2⃣ 15 years 3⃣ 20 years