Can someone help me understand how to do basic algebra with your own examples

This is geometry. could anyone ? i can't fail this class. my grade is quite low already.

Write the equations in logarithmic form 10^3=1,000

How many liters of peroxide should be added to 12 liters of an 8% peroxide solution so that the resulting solution contains 16% peroxide?   original added new amount of peroxide 0.96 liters x 0.96 + x amount of solution 12 liters x 12 + x 0.18 liter 1.14 liters 1.92 liters 2.10 liters