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

Find the next number in the series below

21 32 54 87 131 ?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

What does below chemistry rebus means?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

John has played 50 ODI's and his average is 50. How many runs should he score in his 51st ODI, so that his average score jumps to 51?

An old Woman left INR 33,333 to be divided equally among two fathers and two sons and each was to receive INR 11,111.
How was this possible?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

What goes up but never comes down?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?