Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

What is the difference between a jeweller and a jailer?

People put me on the table and cut me but do not eat me. What am I?

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

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.

In a football game, Christina defeated Teresa by 2 - 0 but no man from either side scored. How can this be possible?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

Decode below three cipher riddles:

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

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?