New Riddles

Easy Math and Logic

Owe 49+49=98. Plus your $1 = 99. Where is the dollar?

Hard Math and Logic

1/1000 trick coin. Flip 10 heads. Prob it's the trick coin?

Medium Math and Logic

How can the Earth's mass be measured?

Easy Math and Logic

Pick 1 of 1000 seats. 990 empty removed. Odds now?

Medium Math and Logic

Price reduced 23%. Increase needed to restore original?

Hard Math and Logic

100B and 100W pearls. Maximize chance of picking Black.

Medium Math and Logic

How many smartphones are there in London?

Hard Math and Logic

Two 1-hr ropes, burn inconsistently. Measure 45 mins?

Hard Math and Logic

Black win $1, Red lose $1. Quit anytime. Strategy?

Easy Math and Logic

Does running keep you drier than walking in rain?

Medium Math and Logic

Ascend 9-7 Day 1, descend 9-7 Day 2. Spot reached at same time?

Hard Math and Logic

25 horses, 5-horse races. Min races to find top 3?

Hard Math and Logic

Flip 4 coins. At least 2 are tails. Probability exactly 3 are tails?

Medium Math and Logic

10R, 20B, 30G socks in 3 sizes. Min pull for matching pair?

Medium Math and Logic

How many corners (vertices) does a tesseract have?

Hard Math and Logic

Joey/Charlie share 50ml. Joey sips 1/2, Charlie 1/2 of rest, repeat...

Easy Math and Logic

Why are manhole covers round?

Hard Math and Logic

Measure 9 mins using 4-min and 7-min hourglasses.

Medium Math and Logic

Choice: 1) Roll 1 die for $1M x result. 2) Roll 1M times for $1 x total.

Medium Math and Logic

Brick thrown from boat into small pond. Does water level change?

Hard Math and Logic

How many times in 24 hours do clock hands form a 90� angle?

Easy Math and Logic

20-ton lorry on 20-ton bridge. Bird lands halfway. Does it collapse?

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?

Showing 1609 to 1632 of 1824 results

Owe 49+49=98. Plus your $1 = 99. Where is the dollar?

1/1000 trick coin. Flip 10 heads. Prob it's the trick coin?

How can the Earth's mass be measured?

Pick 1 of 1000 seats. 990 empty removed. Odds now?

Price reduced 23%. Increase needed to restore original?

100B and 100W pearls. Maximize chance of picking Black.

How many smartphones are there in London?

Two 1-hr ropes, burn inconsistently. Measure 45 mins?

Black win $1, Red lose $1. Quit anytime. Strategy?

Does running keep you drier than walking in rain?

Ascend 9-7 Day 1, descend 9-7 Day 2. Spot reached at same time?

25 horses, 5-horse races. Min races to find top 3?

Flip 4 coins. At least 2 are tails. Probability exactly 3 are tails?

10R, 20B, 30G socks in 3 sizes. Min pull for matching pair?

How many corners (vertices) does a tesseract have?

Joey/Charlie share 50ml. Joey sips 1/2, Charlie 1/2 of rest, repeat...

Why are manhole covers round?

Measure 9 mins using 4-min and 7-min hourglasses.

Choice: 1) Roll 1 die for $1M x result. 2) Roll 1M times for $1 x total.

Brick thrown from boat into small pond. Does water level change?

How many times in 24 hours do clock hands form a 90� angle?

20-ton lorry on 20-ton bridge. Bird lands halfway. Does it collapse?

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

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

Share this page

Explore