Answer:
25 per day
Explanation:
it says that everyday he saw 25 so if he saw 25 everyday, then by the 5th day, he had seen a total of 125 trains because 25 per day times 5 days =125 trains in 5 days
the unit rate would be once per day he saw 25 trains and each day he adds 25 more trains and on the 5th day he saw 125 trains
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