Which is the smallest number that you can write using all the vowels exactly once?

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

John and Jill are madly in love with each other. To remind Jill of his pure love, John wants to send her a ring by post but in their country where burglary is quite prominent, any package that is not locked comes under the risk of being stolen for the contents.

John and Jill possess many padlocks but neither one of them has the other key.

Can you find a way John can send the ring to Jill safely?

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

Can you make four (4) nines (9) equal 100?

Identify the hidden meaning behind this picture?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?