In "Elementary Algebra Review Part 29," the lesson focuses on solving percent mixture and percent increase problems using algebra. In the first problem, the task is to find how much water to add to 50 grams of pure acid to make a 40% acid solution. By setting a variable for the amount of water, finding the amount of pure acid in each container, and setting the two equal to each other, the lesson demonstrates how to solve for the variable and check the answer. The second problem involves finding the new price of a book that increased by 10% from its original price. By setting a variable for the new price and using the original price and the percent increase to set up an equation, the lesson shows how to solve for the new price and answer the word problem.
Writing and solving an equation for a percent mixture problem and a percent increase problem.
More free YouTube videos by Julie Harland are organized at http://yourmathgal.com