There is a box in which distinct numbered balls have been kept. You have to pick two balls randomly from the lot.

If someone is offering you a 2 to 1 odds that the numbers will be relatively prime, for example
If the balls you picked had the numbers 6 and 13, you lose $1.
If the balls you picked had the numbers 5 and 25, you win $2.

Will you accept that bet?

I have Rs.50 and I spend it in the way as below.

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

What is the largest number you can write with just 3 digits?

Rearrange the letters in "new door" to make one word.

John can place six large boxes or nine small boxes into a carton.

Can you find out in how many cartons can he place sixty-six boxes in total?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

Can you find the thief by just looking at the picture below?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?