Mastering Proportions: Word Problems and Cross-Multiplication

A recipe calls for 2 cups of flour for every 3 cups of sugar. If you have 8 cups of sugar, how many cups of flour do you need?

• 3 cups of flour

• 6 cups of flour

• 4 cups of flour

• 5.33 cups of flour

A car travels 150 miles on 5 gallons of gas. How many gallons of gas will it need to travel 300 miles?

• 10 gallons

• 15 gallons

• 20 gallons

• 5 gallons

In a class, the ratio of boys to girls is 4:5. If there are 20 boys, how many girls are in the class?

• 20

• 30

• 25

• 15

A map shows that 1 inch represents 10 miles. If two cities are 3 inches apart on the map, how far apart are they in real life?

• 20 miles

• 30 miles

• 15 miles

• 25 miles

A recipe requires 3 eggs for every 4 servings. How many eggs are needed for 10 servings?

• 8 eggs

• 4 eggs

• 6 eggs

• 10 eggs

A store sells 5 apples for $2. How much would 15 apples cost?

• $6.00

• $10.00

• $8.00

• $4.00

If 6 notebooks cost $12, how much would 10 notebooks cost?

• $20

• $25

• $15

• $30

A car can travel 240 miles on 8 gallons of gas. How many miles can it travel on 12 gallons?

• 360 miles

• 480 miles

• 300 miles

• 240 miles

In a school, the ratio of teachers to students is 1:15. If there are 30 teachers, how many students are there?

• 450

• 4500

• 600

• 300

A painter can paint 3 rooms in 2 days. How many rooms can he paint in 5 days?

• 5

• 10

• 8

• 7