Cows Mathematic question?

A farmer, died when left behind several cows, according to his posthumous :
1. Wife: half of all the cow plus half ;
2. Eldest son: the balance after wife took plus half cow;
3. Second son: the balance after eldest son took plus half cow;
4. Eldest daughter: the balance after second son took plus half cow;
The result is no cow has been killed, also has not cow extra or less.

The question is:
How many cows the farmer left behind when he died

Monkey and Banana Mathematics Question

Beside a little monkey has 100 bananas, it must pass through 50 meters to its' home, each time it only able to moves 50 bananas or less, it walks 1 meter have to eat one banana.

The question is:
What is the maximum quantity of bananas that monkey able to bring back home.


Hints: He may lay down the banana half way, but must guarantee that every time it walks one meter must have one banana to eat.

What is "IQ"

It was also observed that the gaps between children's mental ages and their chronological ages widened as the children got older.

The 6-year-old with the mental age of 8 had a mental age of 12 by the time he was 9 and a mental age of 16 by the time he was12. Similarly, the 6-year-old with a mental age of 4 had a mental age of 6 when he was 9 and a mental age of 8 when he was 12. In 1912, the German psychologist, William Stern, noticed that even though the gap between mental age and chronological age widens as a child matures, the ratio of mental age to chronological age remains constant (and, as we will see, remains essentially constant throughout life).

This constant ratio of mental age divided by chronological age was given the name "Intelligence Quotient". Actually, the intelligence quotient is defined as 100 times the Mental Age (MA) divided by the Chronological Age (CA).

IQ = 100 MA/CA.