#21 - Mathematics Trivia Riddle
Which three numbers have the same answer whether they are added or multiplied together?
1 2 and 3
1 + 2 + 3 = 1 * 2 * 3 = 6
#22 - Secret Code puzzle
A man wanted to get into his work building, but he had forgotten his code. However, he did remember five clues. These are what those clues were:
The fifth number plus the third number equals fourteen.
The fourth number is one more than the second number.
The first number is one less than twice the second number.
The second number plus the third number equals ten.
The sum of all five numbers is 30.
What were the five numbers and in what order?
7, 4, 6, 5, 8
#23 - Professor Riddle
A professor thinks of two consecutive numbers between 1 and 10.
'A' knows the 1st number and 'B' knows the second number
A: I do not know your number.
B: Neither do I know your number.
A: Now I know.
There are four solution for this.What are they ??
2-3
3-4
7-8
9-10
#24 - Funny Answer to This Riddle
Right now Mum is 21 years older then her child In 6 years her child will be 5 times younger than she. Where is daddy?
5*(X+6) = (X+6)+21
4*(X+6) = 21
X+6 = 5.25
X = -0.75
So daddy is at top of mom
#25 - Gold Bar Fewest Cut Puzzle
A worker is to perform work for you for seven straight days. In return for his work, you will pay him 1/7th of a bar of gold per day. The worker requires a daily payment of 1/7th of the bar of gold. What and where are the fewest number of cuts to the bar of gold that will allow you to pay him 1/7th each day?
Just 2
Day One: You make your first cut at the 1/7th mark and give that to the worker.
Day Two: You cut 2/7ths and pay that to the worker and receive the original 1/7th in change.
Day three: You give the worker the 1/7th you received as change on the previous day.
Day four: You give the worker 4/7ths and he returns his 1/7th cut and his 2/7th cut as change.
Day Five: You give the worker back the 1/7th cut of gold.
Day Six: You give the worker the 2/7th cut and receive the 1/7th cut back in change.
Day Seven: You pay the worker his final 1/7th.
#26 - Weighing Balance Puzzle
You can place weights on both side of weighing balance and you need to measure all weights between 1 and 1000. For example if you have weights 1 and 3,now you can measure 1,3 and 4 like earlier case, and also you can measure 2,by placing 3 on one side and 1 on the side which contain the substance to be weighed. So question again is how many minimum weights and of what denominations you need to measure all weights from 1kg to 1000kg.
For this answer is 3^0, 3^1, 3^2... That is 1,3,9,27,81,243 and 729.
#27 - Hard Maths Puzzle
A high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony:
There are one thousand lockers and one thousand students in the school. The principal asks the first student to go to every locker and open it. Then he has the second student go to every second locker and close it. The third goes to every third locker and, if it is closed, he opens it, and if it is open, he closes it. The fourth student does this to every fourth locker, and so on. After the process is completed with the thousandth student, how many lockers are open?
The only lockers that remain open are perfect squares (1, 4, 9, 16, etc) because they are the only numbers divisible by an odd number of whole numbers; every factor other than the number's square root is paired up with another. Thus, these lockers will be 'changed' an odd number of times, which means they will be left open. All the other numbers are divisible by an even number of factors and will consequently end up closed.
So the number of open lockers is the number of perfect squares less than or equal to one thousand. These numbers are one squared, two squared, three squared, four squared, and so on, up to thirty one squared. (Thirty two squared is greater than one thousand, and therefore out of range.) So the answer is thirty one.
#28 - November Maths Puzzle
The Puzzle: A girl, a boy, and a dog start walking down a road.
They start at the same time, from the same point, in the same direction.
The boy walks at 5 km/h, the girl at 6 km/h.
The dog runs from boy to girl and back again with a constant speed of 10 km/h. The dog does not slow down on the turn.
How far does the dog travel in 1 hour?
10km
Speed us 10km/h
#29 - Math Riddle
Find three whole, positive numbers that have the same answer when multiplied together as when added together.
1,2, & 3
1 x 2 x 3 = 6 and 1 + 2 + 3 = 6
#30 - Maths Joke Puzzle
If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?
pi * z * z * a