Answer
The correct answer is 70.
Here’s why:
The riddle says divide by half, not divide in half.
Dividing by one-half is the same as multiplying by two.
So:
30 ÷ ½ = 60
60 + 10 = 70
Many people mistakenly answer 25 because they read the question too quickly.
Can You Spot the Mistake?
Finally, here is a riddle that tests your visual attention.
Imagine looking at a perfectly clean and ordinary bathroom. The sink, mirror, and countertop all appear normal.
But there is one obvious mistake hidden in the image.
Can you guess what it is?
Answer
The sink does not have a pipe underneath it.