What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

You are mixing a mixture of cement and Sand with five gallons of water. You have a garden hose giving you all the water you need. The problem is that you only have a four-gallon bucket and a seven-gallon bucket and neither has graduation marks. Find a method to measure five gallons.

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

The below mentioned letters have been placed in a order using a logic.

DEAD, BALL, FEAR, SHOP

Can you find the logic?

You can see three almost identical images below. Can you spot the odd one out from them?