Can you count the number of lines in the below picture?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

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

How many sides does a circle have?

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

What number should come in place of the question mark below?

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

Why is a river so rich ?