Monica made cookies for herself and her family. Her father ate 10 cookies and her mother ate half as much as the father. Her brother ate 2 more than her mother. How many cookies are left for Monica if she made 30 cookies in total?
Monica's mother ate half as many cookies as Monica's father, so she ate 10 cookies / 2 = <<10/2=5>>5 cookies.
Monica's brother ate 5 cookies + 2 cookies = <<5+2=7>>7 cookies.
There were 30 cookies - 7 cookies - 5 cookies - 10 cookies = <<30-7-5-10=8>>8 cookies left for Monica.
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