35% of the cookies have nuts and chocolate chips because 100 - 25 - 40 = <<100-25-40=35>>35
60% of the cookies have nuts in them because 25 + 35 = <<25+35=60>>60
She makes 36 cookies with nuts in them because 60 x .6 =<<36=36>>36
She needs 72 nuts because 36 x 2 = <<36*2=72>>72
#### 72