Answer is in the picture.
the sum of three consecutive even numbers is 78. what is the first number ? a (24) b (26) c (28) d (30)
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As a practical equation, this one doesn't make much sense -- why would the profit per person have a term proportional to the number of people? Let's just go with it.
That's the answer to the first part.
35/x represents a portion of the profit that's 35/x per person, or a constant $35 per tour.