mixture problems
Hi alll-
I have two homework problems that I need help with:
1. How many liters of pure water should be evaporated from 7.5 liters of a 15% acid solution so that the solution that remains is a 20% acid solutions.
2. The number N of guests that arrive at a mall food court each hour can be approximated by N = -12x(square) + 110x + 35, where x is the number of hours after 11:00 am. At what times, to the nearest minute, are 200 guests per hour arriving at the food court?
Thanks for helping in advance.
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