Which Number is the odd one out?

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

You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

What is the centre of gravity?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

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

I am an eight letter word and I am a computer terminology.
The second, third and fourth letters make an animal.
The fourth, fifth, sixth, seventh and eighth letters make a weapon.
The first, second, third and fourth letters can be taken as an outcome of any exam.
The fifth, sixth, seventh and eighth letter combine to form a high end typing software.

Can you tell who am I ?

Count the number of triangles in the given picture.

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

You need to arrange three 7 and mathematical symbols to form number 1?

I have Rs.50 and I spend it in the way as below.