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Answer:
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Each student spends $25 for entrance and $10 for travel.
If there are 20 students, then the total cost can be expressed as following.
1) 25*20 + 10*20 = 500 + 200 = 700
It means 20 people spend $500 for entrance and $200 for travel.
2) (25 + 10)*20 = 35*20 = 700
It means each person spends a total of $35 and all 20 spend $700.