human
Lenny bought 20 boxes of pens. Each box contained  5 pens. She gave 40% of the pens to her close friends and one-fourth of what's left to her classmates. How many pens were left for Lenny?
assistant
How many pens does Lenny have? ** Lenny has 20 x 5 = <<20*5=100>>100 pens.
How many pens did Lenny give to her close friends? ** She gave her close friends 100 x 40% = <<100*40*.01=40>>40 pens.
How many pens were left for Lenny? ** So, 100 - 40 = <<100-40=60>>60 pens were left.
How many pens did Lenny give to her classmates? ** Half of 60 is 60/4= <<60/4=15>>15 pens.
How many pens were left for Lenny? ** Thus, Lenny has 60 - 15 = <<60-15=45>>45 pens left.
#### 45