#261 - Number Fact Puzzle
The square of the number 111,111,111 is amazing.Whats that ?
12,345,678,987,654,321 Amazing :-)
#263 - Maths Handshake Puzzle
At a party, everyone shook hands with everybody else. There were 66 handshakes. How many people were at the party?
12
In general, with n+1 people, the number of handshakes is the sum of the first n consecutive numbers: 1+2+3+ ... + n.
Since this sum is n(n+1)/2, we need to solve the equation n(n+1)/2 = 66.
This is the quadratic equation n2+ n -132 = 0. Solving for n, we obtain 11 as the answer and deduce that there were 12 people at the party.
Since 66 is a relatively small number, you can also solve this problem with a hand calculator. Add 1 + 2 = + 3 = +... etc. until the total is 66. The last number that you entered (11) is n.
#264 - Number Series Problem
What number comes next in this sequence:
7 8 5 5 3 4 4 ?
6- the number of letters in the month august; (January has 7 letters, February has 8 etc.)
#265 - Easy Logic Problem
My sock drawer has 26 blue socks, 13 pink socks, 33 green socks, and 12 red socks, how many socks would I have to pull out in the dark to be sure i had a matching pair?
Five. There are only four colors, so five socks guarantee that two will be the same color.
#266 - Thinking Puzzle
You are driving down the road in your car on a wild, stormy night, when you pass by a bus stop and you see three people waiting for the bus
An old lady who looks as if she is about to die.
An old friend who once saved your life.
The perfect partner you have been dreaming about.
Knowing that there can only be one passenger in your car, whom would you choose?
The old lady of course! After helping the old lady into the car, you can give your keys to your friend, and wait with your perfect partner for the bus
#267 - Tricky Equation Puzzle
Can you arrange four 9's and use of atmost 2 math symbols , make the total be 100?
99 / .99
#268 - Smart Puzzle
Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person left-hands? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be ?
The product of the number of fingers on the left-hands of every person is zero. It only takes one person to have no fingers on their left hand for the product to be zero, because anything multiplied by zero equals zero.
#269 - King Gift Puzzle
King Charles want to send the diamond ring to his girlfriend securely.He got multiple locks and their corresponding keys.His girl friend does not have any keys to these locks and if he send the key without a lock , the key can be copied in the way.How can charles send the ring to his girl friend securely .
charles put the ring into the box, secure it with one of your locks, and send the box to the girl firend.
She should then attach one of his own locks and return it. When you receive it again, remove your lock and send it back with her lock. Now she can unlock his own lock and retrieve the object.
#270 - Maths Equation Operator Puzzle
I know there are two methods by using three time the same number with an plus(+) operator , you can make sum as 60.
One of them is 20+20+20.
whats the other way ?
The Other way is 55+5