Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

What four weights can be used to balance from 1 to 30 pounds?

A father's child, a mother's child, yet no one's son.

Who am I?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

How many sides does a circle have?

What makes this number unique: 8,549,176,320?

A time long back, there lived a king who ruled the great kingdom of Trojan House. As a part of the renovation of the kingdom to meet future security needs, he asked his chief architect to lay down a new play in a manner that all of his 10 castles are connected through five straight walls and each wall must connect four castles together. He also asked the architect that at least one of his castles should be protected with walls. The architect could not come up with any solution that served all of King's choices, but he suggested the best plan that you can see in the picture below. Can you find a better solution to serve the king's demand?

Can You Find the Missing Zero? A Number Puzzle that Will Trick Your Eyes

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?