<PRE><B>Question 618862</B>
A rock-climbing gym charges nonmembers $18 per day
to use the wall plus $7 per day for equipment rental. 
Cost = (18+7)d = 25d
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Members pay an annual fee of $400 plus $5 per day for equipment rental.
Cost = 400 + 5d
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How many days must both a member and a nonmember use the wall in one 
year so that both pay the same amount?
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Equation:
Solve:
25d = 400 + 5d
20d = 400
d = 20 days (Equal cost at 20 days)
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Cheers,
Stan H.
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