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

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

A man dies of old age on his 25 birthday. How is this possible?

Prove that the below maths equation is true.

8 + 8 = 91

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

what does this below rebus represent identXQQQQQME

Can you count the number of squares in the figure below?

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15