How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

The Puzzle: A girl, a boy, and a dog start walking down a road.

They start at the same time, from the same point, in the same direction.

The boy walks at 5 km/h, the girl at 6 km/h.

The dog runs from boy to girl and back again with a constant speed of 10 km/h. The dog does not slow down on the turn.
How far does the dog travel in 1 hour?

What does this rebus riddle mean?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

Can you find out which triangle will have a bigger area among the following?
1. A triangle with sides 300, 400 and 500
2. A triangle with sides 300, 400 and 700

In the picture given below, can you find out which digit will take place of the question mark?

One day Jenifer meets the Lion and the Tiger in the Forest of Forgetfulness. She knows that the Lion lies on Mondays, Tuesdays, and Wednesdays, and tells the truth on the other days of the week. The Tiger, on the other hand, lies on Thursdays, Fridays, and Saturdays, but tells the truth on the other days of the week. Now they make the following statements to Jenifer:

Lion: Yesterday was one of my lying days.

Tiger: Yesterday was one of my lying days too.

What day is it?

Why do Chinese men eat more rice than Japanese men do ?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?