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I dont get the number part. But ill tell you how MDAS works.
MDAS stands for (Multiplication, Division)(Addition,subtraction)
When you see a problem, always look for terms with multiplication or division first then do it from left to right.
For example:
*Group first the tems with the operations division and multiplication.
*Answer what's inside the parenthesis.
*Answer what's left

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This is how I understand your question
4+(11*5/10)-20= 4+(55/10)-20=4+5.5-20=9.5-20

In MDAS it's simply following the sequence, do the multiplication and division first then the addition and subtraction

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