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Logic Puzzles and Brain Teasers

Hard Math and Logic

Family has 2 kids, one is a boy. Probability the other is a girl?

Medium Math and Logic

5 cats catch 5 mice in 5 mins. Cats needed for 100 mice in 100 mins?

Hard Math and Logic

100 people flip switches of multiples of their entry. How many stay on?

Medium Math and Logic

How many gas stations are there in the United States?

Hard Math and Logic

2 A and 2 B pills identical. Hand has 1A, 2B. How to get correct dose?

Hard Math and Logic

10x10x10 cube painted then cut into 1x1x1s. How many have no paint?

Hard Math and Logic

3-pointer (40% win) or 2-pointer (70% tie, then 50% OT win)?

Medium Math and Logic

9 marbles, one is heavier. Min weighings on a balance to find it?

Medium Math and Logic

What is the sum of all the integers from 1 to 100?

Medium Hard & Challenging

You measure my life in hours and I serve you by expiring. I'm quick when I'm thin and slow when I'm fat.

Easy Hard & Challenging

I am tall when I'm young and short when I'm old. I can brighten your day unless it's windy.

Medium Hard & Challenging

I have lakes with no water, mountains with no stone and cities with no buildings.

Easy Hard & Challenging

If you drop me I'm sure to crack, but give me a smile and I'll always smile back.

Medium Hard & Challenging

I am always hungry and will die if not fed, but whatever I touch will soon turn red.

Hard Hard & Challenging

I turn once, what is out will not get in. I turn again, what is in will not get out.

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