A jar contains 9 blue pens, 21 black pens, and 6 red pens. Four blue pens are removed and then seven black pens are removed. How many pens are left in the jar?
There are 9-4 = <<9-4=5>>5 blue pens left in the jar.
There are 21-7 = <<21-7=14>>14 black pens left in the jar.
There are 5+14+6 = <<5+14+6=25>>25 pens left in the jar.
#### 25