Can you find the missing piece of the Porsche?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

what does this picture(rebus) riddle means ?

Identify the 10 differences between the two given pictures.

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

What occurs twice in a week, once in a year but never in a day?

Solve the following series:
AZ, GT, MN, __, YB

On a bright sunny day, two fathers took their son fishing in the lake. Each man and son were able to catch one fish. When they returned to their camp, there were only three fishes in the basket. What happened?

PS: None of the fish were eaten, lost, or thrown back.

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?