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Read the situation and answer the question that follow.

In a field trip by Grade V class, 10 children took the roller coaster ride, 15 took the merry-go-round, 5 took boating and rest just walk around. There are 35 pupils in Grade V class.


Question: The lowest term for the number of pupils just walk around to the numbers of pupils who took the roller coaster ride.

A. 1 : 3 B. 1 : 2 C. 1 : 4 D. 1 : 5​