Lesson 20 Review

How do you solve for x?

 $45x=540$  

• Add 45 to both sides

• Divide both sides by 45

• Multiply both sides by 45

• Subtract both sides by 45

After dividing both sides of the equation by 45, what is the value of x?

 $45x=540$  

•  $x=4$  

•  $x=17$  

•  $x=12$  

•  $x=23$  

Marco wanted to buy a book about basketball. The book was $25.00 new. His friend Josh told him to check the used book store. The book was $15.00 used. What percentage was the book marked down?

• $80\%$

• $26\%$

• $4\%$

• $40\%$

Camila types 40 words per minute. Which proportion would determine how many words she could type in 16 minutes?

• $\frac{40}{x}=\frac{16}{1}$

• $\frac{40}{1}=\frac{x}{16}$

• $\frac{16}{40}=\frac{x}{1}$

A video game store sold 65 video games on Friday. On Saturday, they sold 104 video games. What was the percent of change?

• $60\%$

• $30\%$

• $50\%$

• $45\%$

A cell phone company is offering 40% off a new cell phone if an old cell phone is traded in.

Part 1

What is the amount of the discount if the new cell phone is $251?

• $100.40

• $42

• $116

• $141

A cell phone company is offering 30% off a new cell phone if an old cell phone is traded in.

Part 2

What is the discounted price of the new cell phone?

-Remember the original price is $251.

• $150.60

• $178

• $149.67

• $118.90

The tennis team is selling tickets to a car wash for $6. When they do not sell very many tickets, the team decreases the price 25%. What is the new cost of a ticket?

• $1.50

• $2.50

• $3.50

• $4.50

Mr. Krogman usually prices the umbrellas in his store at $8 each. However, on rainy days he increases the price by 75%. How much does he charge for an umbrella on a rainy day?

• $2

• $6

• $9.38

• $14

A pair of sandals is on sale for 20% off the original price. If the original price of the sandals is $21, what is the sale price?

• $16.50

• $16.80

• $17.20

• $17.60

• $4.20