What word is pronounced the same if you take away four of its five letters?

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 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?

The more you take me, the more you leave me behind.
Who Am I?

In a basket of apples,
when counted in twos, there was one extra
when counted in threes, there were two extra when counted in fours, there were three extra
when counted in fives, there were four extra
when counted in sixes, there was five extra.

However, if the apples were counted in sevens, no extra apple was left. Can you calculate the minimum number of apples that were present in the basket?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

What is always in front of you but can’t be seen?

What's the only room from which no one can enter or leave

What number do you get when you multiply all of the numbers on a telephone's number pad?

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?