Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

You see me once in June, twice in November, and not at all in May. What am I?

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

Can you place six X (crosses) in below board without making three in a row in any way ?

What Adam and Eve do not have but the rest of the people have?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?