I am an odd number. Take away a letter and I become even. What number am I?

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

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

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?

Can you write down eight eights so that they add up to one thousand?

Can you discover the missing number in this series?

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

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

I shave every day, but my beard stays the same. What am I?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99