Solving Ratio and Percent Problems using Proportions

This video tutorial teaches how to solve ratio and percent problems using proportions. It explains the concept of proportions as equivalent ratios and demonstrates how to use multiplication to establish relationships between ratios. The tutorial includes examples, such as calculating the cost of a lunch with gratuity and determining car sales with a percentage increase, to illustrate the application of proportions in real-world scenarios.

What is a proportion?

• A single ratio

• Two equivalent ratios

• A percentage increase

• A ratio with a fraction

Which of the following is NOT a way to write a ratio?

• Using a fraction bar

• Using a colon

• Using a percentage

• Using the word 'to'

How can you prove that two ratios are equivalent?

• By dividing them

• By adding them

• By subtracting them

• By multiplying them

If Margie's total lunch cost is $9.43 including a 15% gratuity, what is the cost before gratuity?

• $8.20

• $7.50

• $9.00

• $9.43

A salesperson sold 5 cars last month and 20% more this month. How many cars did he sell this month?

• 8 cars

• 7 cars

• 6 cars

• 5 cars