There are 40 x 25% = <<40*25*.01=10>>10 students who wear glasses.

There are 40 x 40% = <<40*40*.01=16>>16 students who wear contact lenses.

There are 10 + 16 = <<10+16=26>>26 students who wear vision assistance.

There are 40 - 26 = <<40-26=14>>14 students who do not wear any vision assistance wear.

# Answer

14
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
There are 40 students in the 6th  grade.  25% of them wear glasses and 40% of them wear contact lenses.  How many students do not wear any vision assistance wear?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
14
There are 40 students in the 6th  grade.  25% of them wear glasses and 40% of them wear contact lenses.  How many students do not wear any vision assistance wear?
train