Answer:
15 years
Explanation:
Let x = Sanjay's present age.
Given information:
- Sanjay will be 3 times as old as he was 4 years ago after 18 years.
Create an equation with the defined variable and the given information:
⇒ 3(x - 4) = x + 18
Apply the Distributive Property of Subtraction:
⇒ 3(x) - 3(4) = x + 18
⇒ 3x - 12 = x + 18
Subtract x from both sides:
⇒ 3x - 12 - x = x + 18 - x
⇒ 2x - 12 = 18
Add 12 to both sides:
⇒ 2x - 12 + 12 = 18 + 12
⇒ 2x = 30
Divide both sides by 2:
⇒ 2x ÷ 2 = 30 ÷ 2
⇒ x = 15
Therefore, Sanjay's present age is 15 years.