If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Count the squares in the matchstick puzzle below?

Which Burger Is Different in below image?

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

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

A man is found dead with a knife in his back When the investigation is done. A chair lays beside him and the forensic team finds moisture around the body.

If he committed suicide, how did he do it?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

What has a bottom at the top?

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?