How do you go from 98 to 720 using just one letter?

Which Burger Is Different in below image?

If eleven plus two equals one, what does nine plus five equal?

Our product and our sum always give the same answer. Who are we?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

An octopus has 8 legs. A hippogriff has 6 legs and 2 pairs of wings. A sphinx has 6 legs and one pair of wings. Now we have all 3 kinds and a total of 18 insects in a cage. We have a total of 118 legs and 20 pairs of wings. How many insects do we have of each kind?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

Prove that twice of ten is the same as twice of eleven.

John, Jack and Jill are in a desert. John doesn't like Jill and hence decides to murder him. He poisons the water supply of Jill. Since it is a desert area, Jill must drink or he will die of thirst.

Jack does not know of the actions of John and also decides to murder Jill. To succeed in his ill motives, he removes the water supply of Jill so he dies of thirst.

Jill dies due to thirst. Who murdered Jill?