it's 7
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The number that both 7 and 8 can go into evenly is 56.
Lets see if 217 is a prime or composite number. 15 times 15 is 225, so we will try the first prime numbers up to 15. They are 2, 3, 5, 7, 11, and 13. Will 2 go into 217? No 7 is odd. Will 3 go into 217. If we add the integers, they add up to 10. 3 does not go into 10. Will 5 go into 217. No. It does not end in a 0 or a 5. Will 7 go into 217. Lets see. Will 7 go into 21? Yes it goes in an even number of times. How about that. Will seven go into 7. Yes it goes in an even number of times. You can show the math.
56
The first number that 12 and 16 go into is 48.
The median of the first 7 is the fourth prime = 7.The median of the first 7 is the fourth prime = 7.The median of the first 7 is the fourth prime = 7.The median of the first 7 is the fourth prime = 7.