Start with taking out the older pennies 200 pennies - 30 pennies = <<200-30=170>>170 pennies

Take the 170 pennies * .20 = <<170*.20=34>>34

170 pennies - 34 pennies = <<170-34=136>>136 pennies.

# Answer

136
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Iain has 200 pennies. He realizes that 30 of his pennies are older than he is. If he wishes to get rid of these pennies and then throw out 20% of his remaining pennies, how many will he have left?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
136
Iain has 200 pennies. He realizes that 30 of his pennies are older than he is. If he wishes to get rid of these pennies and then throw out 20% of his remaining pennies, how many will he have left?
train