Why is a river so rich ?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

If you say my name, I will no longer exist. What am I?

What is next number in the pattern below:

131 517 192 123 ?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

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

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

Why is the Hole below a Lock?

Decode below three cipher riddles:

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

If an earthquake is 1 point higher on the Richter Scale than another earthquake which is actually 10 times stronger, how much stronger would an earthquake be if it was just half a point higher on the Richter scale?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?