BrainTeasers

Front

If it takes 5 machines 5 minutes to make 5 widgets, how long would it take 100 machines to make 100 widgets?

Back

5 minutes

Front

A snail climbs up 3 feet during the day and slips back 2 feet at night. If the well is 30 feet deep, how many days will it take for the snail to get out of the well?

Back

27 days

Front

What is the next number in the sequence: 2, 6, 12, 20, 30, ...?

Back

42

Front

If you multiply this number by any other number, the answer will always be the same number. What is it?

Back

0

Front

A farmer has 17 sheep, and all but 9 die. How many are left?

Back

9

Front

If you write down all the numbers from 1 to 100, how many times do you write the digit 3?

Back

19

Front

If a train travels 60 miles in 1.2 hours, what is its average speed in miles per hour?

Back

50 mph

Front

How many blocks?

Back

9

Front

What is the answer?

Back

35

Front

What can you break without touching it?

Back

a promise