Mastering Proportions: Word Problems and Cross-Multiplication

A recipe calls for 2 cups of flour for every 3 cups of sugar. If you want to use 6 cups of sugar, how many cups of flour do you need?

• 2 cups of flour

• 6 cups of flour

• 3 cups of flour

• 4 cups of flour

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

• 20 gallons

• 15 gallons

• 10 gallons

• 5 gallons

If 4 apples cost $2, how much would 10 apples cost?

• $3.00

• $5.00

• $6.00

• $4.00

A map shows that 1 inch represents 20 miles. If two cities are 3 inches apart on the map, how far apart are they in real life?

• 40 miles

• 80 miles

• 60 miles

• 100 miles

In a school, the ratio of boys to girls is 3:4. If there are 24 girls, how many boys are there?

• 16

• 20

• 22

• 18

A painter can paint 5 rooms in 2 days. How many rooms can he paint in 10 days?

• 25 rooms

• 20 rooms

• 30 rooms

• 15 rooms

If 6 notebooks cost $12, how much would 15 notebooks cost?

• $24

• $36

• $30

• $18

A recipe requires 3 tablespoons of oil for every 2 cups of rice. How much oil is needed for 8 cups of rice?

• 6 tablespoons of oil

• 10 tablespoons of oil

• 12 tablespoons of oil

• 8 tablespoons of oil

If a car can travel 180 miles on 6 gallons of gas, how far can it travel on 10 gallons?

• 150 miles

• 300 miles

• 240 miles

• 180 miles

In a class, the ratio of students who like math to those who like science is 5:3. If there are 40 students who like math, how many students like science?

• 30

• 18

• 24

• 20