I am an odd number. Take away a letter and I become even. What number am I?

When does a USA Potato change its nationality?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

You can see it everyday, But cannot touch it at will. What is it?

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

A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?