What has many keys but can’t open a single lock?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

Do You See It?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

Using eight eights and addition only, can you make 1000?

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 ?

who is silent in the parliament?

What am I?

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?