Multiple choice

Robin's father is 3 times as old as Robin. His father was 4 times his age 5 years ago. Which of the following expressions represents the given situation?

  1. (x – 5) = 4(3x)

  2. 4(x – 5) = 3x

  3. (x – 5) = 4(3x – 5)

  4. 4(x – 5) = (3x – 5)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let Robin's current age be x. His father's current age is 3x. Five years ago, Robin was (x - 5) and his father was (3x - 5). The problem states the father was 4 times Robin's age then, so 4(x - 5) = 3x - 5.

AI explanation

Let Robin's present age be x, so his father's present age is 3x. Five years ago, Robin's age was (x - 5) and his father's age was (3x - 5). The problem states the father was four times Robin's age at that time, which translates to the equation 4(x - 5) = (3x - 5).

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