Question 1
The difference between Sudhir and Elena's ages is 70 years. In 5 years, Sudhir's age will be 3 times Elena's age. How old is Sudhir now?
Let Elena = x = 30
Then Sudhir = x + 70 = 30 + 70 = 100
Check: In 5 years, Sudhir+5 = 105
3 × (Elena+5) = 3 × 35 = 105 ✓
Then Sudhir = x + 70 = 30 + 70 = 100
Check: In 5 years, Sudhir+5 = 105
3 × (Elena+5) = 3 × 35 = 105 ✓