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

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

I have two sand hourglasses:
1. A 7 minute one and
2. An 11-minute one.

Using just these 2 sand hourglasses, how can I measure time as 15 minutes?

This is a simple one. You just have to count the number of Fs in the given sentence.

Finished Files are the result of years of scientific study combined with the experience of years.

How many did you count?

What jumps when it walks and sits when it stands?

What is more useful when it is broken?

what one word does the below rebus identifies?

Can you find out the number of the parking space in which the car is parked?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

What does this mathematical rebus means ?