Sabrina had 20 - 10 = <<20-10=10>>10 cookies left after giving 10 cookies to her brother.

Sabrina's mother gave her 10/2 = <<10/2=5>>5 cookies.

So, she had 10 + 5 = <<10+5=15>>15 cookies then.

She gave 15 x 2/3 = <<15*2/3=10>>10 cookies to her sister.

Therefore, she only has 15 - 10 = <<15-10=5>>5 cookies left.

# Answer

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<|im_start|>user
Sabrina gave 10 cookies to her brother. Her mother gave Sabrina half the number of cookies she gave her brother. Then Sabrina gave two-thirds of her cookies to her sister. If Sabrina had 20 cookies at the start, how many cookies are left with her?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
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user
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Sabrina gave 10 cookies to her brother. Her mother gave Sabrina half the number of cookies she gave her brother. Then Sabrina gave two-thirds of her cookies to her sister. If Sabrina had 20 cookies at the start, how many cookies are left with her?
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