If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

In a school, 280 students studied chemistry, 254 students studied physics and 280 students studied biology.

97 students studied chemistry as well as physics, 138 students studied physics as well as biology and 152 students studied chemistry as well as biology.

73 students studied all the three branches.

Can you find out the total number of students?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

Sherlock breaks into a crime scene. The victim is the owner who is slumped dead on a chair and have a bullet hole in his head. A gun lies on the floor and a cassette recorder is found on the table. On pressing the play button, Sherlock hears the message 'I have committed sins in my life and now I offer my soul to the great Lord' and followed a gunshot Sherlock smiles and informed the police that's its a murder.

Why did he think so?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

What is wrong in the below Picture?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

What goes up but never comes down?