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

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

Joseph buys three kinds of chocolates for 100 rupees. The first one is priced at 5 rupees, second one at 3 rupees and third one at 0.5 rupees.

If he bought 100 chocolates in total, how many pieces do you think he bought each chocolate?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

What goes up but never comes down?

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

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

I am sure no one can have two things for dinner. what are they?

John is 45 years older than his son Jacob. If you find similarities between their ages, both of their ages contain prime numbers as the digits. Also, John's age is the reverse of Jacob's age.

Can you find their ages?