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A lab technician mixed a 660 ml solution of water and alcohol. If 3% of the solution is alcohol, how many milometers of alcohol were used, and how many milometers of water were used?
 1. Multiply the total (660) times the percentage (0.03) to find out how much alcohol there is, you need 3% of the solution.
 2. You then subtract whatever number you get (19.8) from the total (660) and you get how much water there is (640.2).

A basketball team sells tickets that cost $10, $20, or, for VIP seats $30. The team has sold 493 tickets overall. It has sold 187 more $20 tickets than $10 tickets. The total sales are $8870. How may tickets of each kind have been sold?
This ends up being just a substitution problem with three equations. First find the equations,
 1. x+y+z=493
 2. 10x+20y+30z=8870
 3. y=x+187
Then substitute in y where it needs to be, getting rid of y, then use the substitution method to get rid of the x or z and give the number up by itself. Solve like any other substitution problem. :)

When multiplying exponents:
You add them,
(x^2)^4 = 8^6

(3k)^{3}m^{3
}(km)^{2}
27k^{5
}m

