A medium math riddle
When I was 6, my sister was half my age. Now I am 40. How old is my sister?
💡 Need a hint?
The age gap never changes.
Show the answer
37
Also accepted: thirty-seven, 37 years old.
Think it through before you peek. Stuck? Read the riddle out loud: many riddles hide the answer in a word with two meanings.
3 more riddles like this
- Using only addition, how can you add eight 8s to get 1,000? See the answer →
- A clock strikes 6 times at 6 o'clock, and it takes 5 seconds from the first strike to the last. How long does it take to strike 12 times at noon? See the answer →
- I am a three-digit number. My tens digit is 5 more than my ones digit, and my hundreds digit is 8 less than my tens digit. What number am I? See the answer →
Frequently asked questions
What is the answer to the riddle "When I was 6, my sister was half my age. Now I am 40. How old is my sister?"
The answer is 37. The age gap never changes.
Is this riddle hard?
It is rated medium. It takes a moment of thinking, and the hint usually unlocks it.
Where can I find more riddles like this?
This riddle is in the math riddles and puzzles, logic puzzles, and riddles for adults lists on Quiz Zoomies, each with hints and hidden answers.
More riddle lists
A new quiz every day on YouTube
Flags, capitals, trivia, riddles and brain teasers. Subscribe to Quiz Zoomies and test yourself with a new quiz video every day, plus Shorts in between.