What is common among 11, 69, and 88?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

What is the next number in the series?

15 29 56 108 208 ?

Which tank will fill first?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

Keyboard words are not in alphabetical order, Why?

O_er_t_o_

Complete the missing letters of the given word.

One day, I thought of ways that can be used for creating a palindrome. So I decided that I will turn into a larger number by adding the reversed digits to the original number and keep doing it till I finally obtained a palindrome.

I am not sure if this process will always result in a palindrome eventually but I was able to produce a four-digit palindrome. Can you guess my starting number?

John buys rice at Rs.60/kg from Britain and then sells them at Rs.5/kg in India. As a result of this, he becomes a millionaire. How come?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?