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Ivan is participating in a 5 - day cross - country biking challenge. He biked for 4 4 , 5 2 , 6 2 ,

Ivan is participating in a
5
-day cross-country biking challenge. He biked for
44
,
52
,
62
,and
51
miles on the first four days. How many miles does he need to bike on the last day so that his average (mean) is
54
miles per day?
miles

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