Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

What does this below rebus puzzle mean?

Can you divide the below-given shape into four equal and identical pieces?

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?

Jessica is telling her friends this story and asks them to guess if it’s the truth or a lie: “There was a man sitting in a house at night that had no lights on at all. There was no lamp, no candle, and no other source of light. Yet, he sat in the house and read his book happily.” Her friends say she’s lying, but Jessica corrects them and says she’s telling the truth. Jessica’s story is true—but how?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

On one occasion, A Boy collects 71 rupees in form of 20 paise and 25 paise. He collects a total of 324 coins.

Can you tell me how many 20-paisa and 25-paisa he got?