using four eights (8) and a one (1) and one mathematical symbol , create the number 100

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.

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

In order to complete the racing competition, the Mexico racetrack has to submit its top and the most famous three horses to win the competition. Due to an electrical storm, all the records are cleared and no one knows which horse holds the record. They all look identical and it becomes even more difficult to differentiate the horses. There are 25 horses in the Mexico racetrack. But there can be only five horses at a time on the track. What will the least number of races that can be conducted to find out the three fastest horses?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

In an Art Gallary, When the clock hit 11 am, Artist hung the painting number 30. When it struck 4 pm, he hung painting number 240 and when it struck 7:30 pm, he hung painting number 315.

Can you determine, which painting number will he hang when the time is 9:20 pm?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?