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? Give me reasons, before answering the question
Start with taking out the older pennies 200 pennies - 30 pennies = 170 pennies. Take the 170 pennies * .20 = 34. 170 pennies - 34 pennies = 136 pennies. So the final answer is 136.