Logic Riddles

Logic riddles with answers involve looking at situations and making judgements about them by ruling out impossibilities. If you like solving maths puzzles, you will most probably like logic riddles as well.

Cookie Problem

In a cookie jar, there are ten butter cookies and ten chocolate-chip cookies. Tom sneaks over to the cookie jar in the middle of the night and tries to figure out:

  • How many cookies do I need to take out of the jar if I want to make sure to get at least two of each kind?
  • How many cookies do I need to take out of the jar if I want to make sure to get at least two butter cookies?
Riddle Answer

Brilliant Sister

Peter says to his sister Bitsy, “Because I’m twice as old as you, I’m twice as smart, too.” His sister responds, “Yes, but in five years I’ll be twice as old as I am now, and you won’t.”

Peter is dumbfounded, and he stops to calculate how old he and his sister will be in five years. Do you know the answer?

Riddle Answer