What begins with T, ends with T, and has T in it?

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

What goes up but never comes down?

Can you divide numbers from 1 to 9 (1 2 3 4 5 6 7 8 9) into two groups so that the sum of the numbers of each group is equal?

Note: 9 cannot be turned over to make it 6.

Can you find out the total number of triangles in the given figure?

With the help clues provided in the image, can you find the 5 digit key?

Forwards I am heavy, backward I am not. What am I?

Which five letter word can be added at the end of below word to form a
valid word?

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A train leaves from point A for point B at 80 mph. After half an hour, another train leaves from point B for point A at 60 mph.

Which of the trains will be farther from point A when they meet ?

2, 3, 5, 9, 17, _ What is the next number in the sequence?