Which Number is the odd one out?

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

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?

How can you make a TV, a bed, a dog, and a car liquid?

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

A few friends are enjoying their sea voyage in a boat full of apples. On the way, they felt hungry and thus decided to eat the apples. Together, they ate two dozen of apples. When they have eaten the apples, will there be any change in the water level?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Find the next number in the series below

21 32 54 87 131 ?

How many times can you subtract the number 5 from 25?

You can win me and lose me but never buy me
You can not eat me and never want to part with me
I can make you cry or bring you joy
I am not a machine and definitely not a toy
You keep me but i am not forever just yours
You might find me in a case or on a shelf next to a vase
I am hard and i am tall if you bump me i am sure to fall
I am made of different materials and am at many events
If your lucky and fight hard I might be yours
What am I ?