Why is a river so rich ?

You need to remove two matchsticks to make the below equation true. Can you do it ?

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

I have thought of a number that is made up by using all the ten digits just once. Here are a few clues for you to guess my number:

First digits is divisible by 1.
First two digits are divisible by 2.
First three digits are divisible by 3.
First four digits are divisible by 4.
First five digits are divisible by 5.
First six digits are divisible by 6.
First seven digits are divisible by 7.
First eight digits are divisible by 8.
First nine digits are divisible by 9.
The number is divisible by 10.

Can you find out the number ?

What does this rebus riddle means ?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

You need to arrange three 7 and mathematical symbols to form number 1?

Peter wakes up daily to pick up his cycle and crosses the border between Spain and France daily with a bag on his shoulder. He is investigated daily by the officials but they don't find anything suspicious.

If we tell you that he is smuggling something what would it be?

When is the top of a mountain similar to a savings account?