It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

What is black when you buy it, red when you use it, and gray when you throw it away?

I look at you, you look at me I raise my right, you raise your left. What am I?

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

Chef Andrea has to light the kitchen stoves to open her restaurant for the day. There are three stoves in the kitchen: A glass stove, a brick stove, and a wood stove. She only has one match. Which does she light up first?