<human>:  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?
<bot>: How many cookies did Sabrina have left after giving 10 cookies to her brother? ** Sabrina had 20 - 10 = <<20-10=10>>10 cookies left after giving 10 cookies to her brother.
How many cookies did Sabrina's mother give her? ** Sabrina's mother gave her 10/2 = <<10/2=5>>5 cookies.
How many cookies did Sabrina have then? ** So, she had 10 + 5 = <<10+5=15>>15 cookies then.
How many cookies did Sabrina give to her sister? ** She gave 15 x 2/3 = <<15*2/3=10>>10 cookies to her sister.
How many cookies are left with her? ** Therefore, she only has 15 - 10 = <<15-10=5>>5 cookies left.
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