#541 - How Many Burgers Maths Problem

If one and a half boys, eat one and a half burgers in one and a half hours.

How many burgers can 9 boys eat in 3 hours ?

18

More hours => more burgers.
More boys => more burgers.

The time become twice (3 hours / 1.5 hours).
Boys become six times (9 / 1.5).

Number of burgers = 2 * 6 * Original(1.5)
= 18

#542 - One Liner Who Am I Riddle

What has no starting, end, or center?

doughnut

#543 - Drive Time Maths Puzzle

Alpha and Beta have same amount of petrol in their respective cars. Alpha can drive for 4 hours whereas Beta can drive for 5 hours with the amount of petrol left.

Both of them start driving at the same time. After a few hours, they find out that the amount of petrol remaining in one of the cars is four times the other car.

Can you calculate for how long did they drive the cars?

3 3/4 hours

Assume that the initial amount of petrol in each of the petrol tanks be P.
Now, let us assume that they drove for H hours.

In that case, the amount of petrol used by one car in H hours will be = P*H /4
The amount of petrol used by the other car will be = P*H/5

Therefore, the petrol left in one car = P - P*H / 4
Petrol left in the other car = P - P*H / 5

Now, according to the question,
P - P*H / 5 = 4 (P - P*H / 4)
=> H = 15 / 4 = 3 3/4 hours.

#544 - Trivia Geography Riddle

Can it be possible to build a house that has all its four walls facing towards the South?

Yes, it is possible.
If the house is built at the North Pole, all the walls will face towards South.

#545 - Romans Castle Brain Twister

Once upon a time, there was a castle on a square island. The entire island was surrounded with a 14m wide trench. The Romans had wanted to invade the castle and had brought a few wooden planks along with them to facilitate themselves in crossing the moat. The planks were however found to be only 13m long.

The Romans still managed to cross the trench. How did they do it?

They managed to cross the trench by placing the planks as it is shown in the picture.

#546 - Shape Four Identical Pieces Puzzle

Can you divide the given shape into four equal and identical pieces?

Shape Four Identical Pieces Puzzle

There is only one way how it can be done and that is shown in the picture.

#547 - Classic Relation Riddle

Two boys take admission in a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

Yes, it is certainly possible. They were not twins but triplets.

#548 - Number Sequence Pattern Problem

In the following series, a set of numbers is progressing with a particular patter. Can you deduce that pattern and find the missing set?

(2 + 6), (21 + 6), (58 + 6), (119 + 6), ___

210+6

The second digit in each set is 6.
If you add the numbers, you will find that they add up to be the cube of 2, 3, 4 and 5.

The next number is 6 and the cube of 6 is 216.

Thus, the last set will be (210 + 6).

#549 - Find Out The Missing Numbers

In the given figure, can you find out the missing numbers?

Find Out The Missing Numbers

The missing numbers are 8 and 7.

The middle number in the triangle is nothing but the square root of the sum of the numbers in the corner.

10 + 22 + 4 = 36
Square Root of 36 = 6

Similarly
10 + 42 + 12 = 64
Square Root of 64 = 8

12 + 22 + 15 = 49
Square Root of 49 = 7

#550 - Movie Tom Riddle

This puzzle is for the Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort ?

If you have read The Chambers of Secrets, you should have known the reason. The phrase "I Am Lord Voldemort" can be used as an anagram to create "Tom Marvalo Riddle".

The book also explained that Voldemort wanted to distance himself from his father Rom Riddle who was a muggle. This was the reason for the change of name.