Sceptic"s annotated Quran

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Hello Rayaan..
May I ask your opinion about some of the mistakes in quran?
First of, Tell me about heritage issue.. Why does allah can't do a simple math??

Allah instructs you concerning your children: for the male, what is equal to the share of two females. But if there are [only] daughters, two or more, for them is two thirds of one's estate. And if there is only one, for her is half. And for one's parents, to each one of them is a sixth of his estate if he left children. But if he had no children and the parents [alone] inherit from him, then for his mother is one third. And if he had brothers [or sisters], for his mother is a sixth, after any bequest he [may have] made or debt. Your parents or your children - you know not which of them are nearest to you in benefit. [These shares are] an obligation [imposed] by Allah . Indeed, Allah is ever Knowing and Wise.
Nisa 11.
And for you is half of what your wives leave if they have no child. But if they have a child, for you is one fourth of what they leave, after any bequest they [may have] made or debt. And for the wives is one fourth if you leave no child. But if you leave a child, then for them is an eighth of what you leave, after any bequest you [may have] made or debt. And if a man or woman leaves neither ascendants nor descendants but has a brother or a sister, then for each one of them is a sixth. But if they are more than two, they share a third, after any bequest which was made or debt, as long as there is no detriment [caused]. [This is] an ordinance from Allah , and Allah is Knowing and Forbearing.
Nisa 12.

Now these are the instructions to divide your heritage..
Lets say you have 3 daughters, a wive, a father and a mother and lets try to divide your heritage;
Lets say you had 60$

"But if there are [only] daughters, two or more, for them is two thirds of one's estate."
so you have 3 daughters... 2/3 of the heritage is theirs.. 60*2/3=40$

"And for one's parents, to each one of them is a sixth of his estate if he left children."
you left children and you have parents that means they will take 1/6 each..
60/6=10*2=20

what have we got so far.. 40$ to girls.. and 20$ to parents.. 40+20=60$ oops we already reached to your whole heritage but we still have to give something to your wife...

"But if you leave a child, then for them is an eighth of what you leave, after any bequest you [may have] made or debt."
Im sorry dude, you left child and your wife wants her share... So she has to get 1/8 of it.. 60/8=7.5$

so 40+20+7.5= 67.5
you need some extra cash sir...
So your god cant even do a simple math.. How come you still believe in him???
Before you start barking about how muslims solve this problem let me warn you:
You can't possibly solve this problem without changing the clear commands of quran!

Quran has so many contradictions in it.. I know that becouse I was a muslim too...
Here if you are intrested we made same discussion with another member of this forum in this thread:
http://atheistforums.org/thread-4054.html
You can find the portions of that contradictions in this thread and we can discuss it further if you like..