Solve each equation mentally.

1. The water level in a reservoir is now 52 meters. If this was a 32% increase, what was the initial depth?

   Diagram:

   Equation:

   Solution:

2. The snow is now 52 inches deep. If this was a 68% decrease, what was the initial depth?

   Diagram:

   Equation:

   Solution:

3. Write a story for one of the equations that doesn’t have a match.

Write an equation to represent each situation. Then, solve the equation.

1. A piece of fabric weighed 15 ounces. After it was decorated with zardozi, the weight had increased by 82%. What is the weight of the finished piece?

   

2. Another finished zardozi piece weighs 22 ounces. This is a 76% increase from the original weight of the fabric. What was the original weight?

3. Before making a mola, the layers of fabric weighed 4.7 ounces. When the mola was finished, the weight had decreased by 17%. What is the weight of the finished mola?

   

4. Another finished mola weighs 4.9 ounces. This is a 21% decrease from the original weight of the fabric. What was the original weight?

1. Last year, scientists counted 12 foxes in a conservation area. This year, they counted 50% more than that. How many foxes did they count this year?

   Explain why this situation can be represented by the equation . Make sure that you explain what represents.

2. Write an equation to represent each of the following situations.
   1. After replacing some grass with rocks, a business decreased its water usage by 20%. If their old water usage was 15,000 gallons per week, how much do they use now?
   2. After a 25% discount, the price of a T-shirt was $12. What was the price before the discount?
   3. Compared to last year, the population of Boom Town has increased by 25%.The population is now 6,600. What was the population last year?