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?

You have two rectangular wires.

Both of them have property that when you light the fire from one end , it will take 60 minutes to get completely burn.

However, they do not burn at consistent speed (i.e it might be possible 1st 20% burn in 50 minutes and 80% can burn in 10 minutes).

So how could you measure 45 minutes ?

I am white when I am dirty, and black when I am clean. What am I?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

When 99 is considered higher than 100?

Which English verb becomes past tense just by rearranging the letters?

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

All of you like to eat me. I am a five-lettered word. Remove the first two and I turn into an infamous animal. Remove just the first and I become a heinous crime. Remove the first and the last and you can groove on me.

Can you guess who am I?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?