Understanding Direct Proportions

What is the definition of direct proportion?

• Direct proportion means that two quantities are always equal to each other.

• Direct proportion is when one quantity remains constant while the other changes.

• Direct proportion is a relationship where two quantities increase or decrease at the same rate.

• Direct proportion is a relationship where one quantity increases while the other decreases.

If 3 apples cost $6, how much do 5 apples cost?

• $8

• $12

• $10

• $15

If y is directly proportional to x, and y = 12 when x = 4, what is y when x = 10?

• 40

• 24

• 15

• 30

In a direct proportion, if one quantity doubles, what happens to the other quantity?

• The other quantity triples.

• The other quantity halves.

• The other quantity remains the same.

• The other quantity also doubles.

If 2 liters of paint cover 50 square meters, how much paint is needed for 200 square meters?

• 8 liters

• 10 liters

• 6 liters

• 4 liters

If the ratio of boys to girls in a class is 3:4, how many girls are there if there are 12 boys?

• 14

• 16

• 10

• 20

If a car travels 60 miles in 1 hour, how far will it travel in 3 hours?

• 240 miles

• 90 miles

• 120 miles

• 180 miles

If the cost of 4 notebooks is $8, what is the cost of 10 notebooks?

• $12

• $15

• $25

• $20

If a recipe requires 2 cups of flour for 4 servings, how much flour is needed for 10 servings?

• 6 cups

• 4 cups

• 3 cups

• 5 cups

If the speed of a train is 80 km/h, how far will it travel in 2.5 hours?

• 200 km

• 150 km

• 250 km

• 300 km