Which tank will fill first?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

What is the centre of gravity?