Multiple choice

Twenty years ago, my age was $\left (\displaystyle \frac{1}{3}\right)$rd of what it is now. What is my present age?

  1. $66$ years
  2. $30$ years
  3. $33$ years
  4. $36$ years
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let present age be x. 20 years ago, age was x-20. Equation: x-20 = (1/3)x. Multiply by 3: 3x - 60 = x. 2x = 60, x = 30.

AI explanation

Let the present age be x. Twenty years ago, the age was x - 20, which equals one third of the present age: x - 20 = x / 3. Multiplying by 3 gives 3x - 60 = x, so 2x = 60 and x = 30 years.

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