How can you make number one disappear by adding something to it?

What is full of holes but still holds water?

You are a cab driver who pools passengers. You pick 3 people from a destination and drop 1 after an hour. 2 people climb aboard at the same time and you drop 3 at the next destination. After some time, you pick 2 passengers only to drop 1 after a short distance where 3 more passengers climb up the cab. You leave the rest of the passengers one by one to their destination and then come back home.

Can you tell the eye color of the cab driver?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

If six children and two dogs were under an umbrella, how come none of them got wet?

How many times in a given day, minutes and hour clock comes in a straight line ?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

The sum of a mother, her baby and her dog's weight is 170 Kg. How much does the baby weigh if the mother weighs 100 kg more than the combined weight of the baby and the dog, and the dog weighs 60 per cent less than the baby?