What is black when you buy it, red when you use it, and gray when you throw it away?

Count the number of times the letter "F" appears in the following paragraph:

FAY FRIED FIFTY POUNDS OF
SALTED FISH AND THREE POUNDS
OF DRY FENNEL FOR DINNER FOR
FORTY MEMBERS OF HER FATHER'S FAMILY.

What do you see in the image below

Find the next number in the following series:
6, 14, 26, 98, __?

Why do people go to bed?

What 5-letter word typed in all capital letters can be read the same upside down?

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?