Brain Teasers
1)How can you add eight 8's to get the number 1,000? (only use addition)
2) Two Fathers and Two Sons Riddle
Two fathers and two sons sat down to eat eggs for breakfast. They ate exactly
three eggs, each person had an egg. The riddle is for you to explain how
3) Digit Frequency
Part I. What digit is the most frequent between the
numbers 1 and 1,000 (inclusive)?
To solve this riddle you don't want to
manually do all of the math but rather try to figure out a pattern.
4) Three Guys at A Hotel Riddle
Three guys rent a hotel room for the
night. When they get to the hotel they pay the $30 fee, then go up to their
room. Soon the bellhop brings up their bags and gives the lawyers back $5
because the hotel was having a special discount that weekend. So the three
lawyers decide to each keep one of the $5 dollars and to give the bellhop a $2
tip. However, when they sat down to tally up their expenses for the weekend the
could not explain the following details:
Each one of them had originally
paid $10 (towards the initial $30), then each got back $1 which meant that they
each paid $9. Then they gave the bellhop a $2 tip. HOWEVER, 3 • $9 + $2 =
$29 The guys couldn't figure out what happened to the other dollar. After
all, the three paid out $30 but could only account for $29. Can you determine
what happened?
5) The Merchant
A merchant can place 8 large boxes or 10 small boxes into
a carton for shipping. In one shipment, he sent a total of 96 boxes. If there
are more large boxes than small boxes, how many cartons did he ship?
6) Three Brothers on a Farm
Three brothers live in a farm. They agreed to
buy new seeds: Adam and Ben would go and Charlie stayed to protect fields. Ben
bought 75 sacks of wheat in the market whereas Adam bought 45 sacks. At home,
they split the sacks equally. Charlie had paid 1400 dollars for the wheat. How
much dollars did Ben and Adam get of the sum, considering equal split of the
sacks?
7) The Insurance Salesman
An insurance salesman walk up to house and
knocks on the door. A woman answers, and he asks her how many children she has
and how old they are. She says I will give you a hint. If you multiply the 3
children's ages, you get 36. He says this is not enough information. So she
gives a him 2nd hint. If you add up the children's ages, the sum is the number
on the house next door. He goes next door and looks at the house number and says
this is still not enough information. So she says she'll give him one last hint
which is that her oldest of the 3 plays piano.