Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Which Number is the odd one out?

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

A man has eighty-one cows ( numbered 1,2,3...81 as such). The beauty is that cow no. 1 gives 1ltr of milk, cow no. 2 gives 2ltrs of milk and so on. The man wants to equally distribute the cows among his nine sons so that each one of them gets the same quantity of milk.

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

There is a place where if I stand up straight, I will still be considered sideways.

There are two words one resembles the "state of rest" and the other is related to "writing/reading material".

Can you name these two words which also sound similar?

I am a number I am not an odd number I am higher than 90 I am not higher than 100 If you subtract me from 100, you get nothing. What number am I?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

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?

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?