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

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

O_er_t_o_

Complete the missing letters of the given word.

What does this mathematical rebus means ?

What seven-letter word has hundreds of letters in it?

A convention is held where all the big logicians are summoned. The master places a band on everyone's forehead. Now all of them can see others bands but can't see his own. Then they are told that there are different colours of bands. All the logicians sit in circle and they are further explained that a bell will ring at regular intervals. The moment when a logician knew the colour of band on his forehead, he will leave at the next bell. If anyone leaves at the wrong bell, he will be disqualified.

The master assures the logicians that the puzzle will not be impossible for anyone of them. How will the logicians manage ?

If one and a half boys, eat one and a half burgers in one and a half hours.

How many burgers can 9 boys eat in 3 hours?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

You have $100 with you and you have to buy 100 balls with it. 100 is the exact figure and you can't go below or above the numbers and you have to use the entire $100. If there is no kind of tax applied how many of each of the following balls will you be able to buy:

Green Balls costing $6
Yellow Balls costing $3
Black Balls costing $0.10

Now, how many of each must you buy to fulfil the condition given?