Liza used 10/2 = <<10/2=5>>5 kilograms of butter for the chocolate chip cookies.
Then, she used 10/5 = <<10/5=2>>2 kilograms of butter for the peanut butter cookies.
She used 5 + 2 = <<5+2=7>>7 kilograms of butter for the chocolate and peanut butter cookies.
So, only 10 -7 = <<10-7=3>>3 kilograms of butter was left.
Then, Liza used 3/3 = <<3/3=1>>1 kilograms of butter for the sugar cookies.
Therefore, only 3-1 = <<3-1=2>>2 kilograms of butter were left.
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