8th Grade Equations: Solve & Evaluate Real-Life Scenarios

A store sells pencils for $0.50 each. If you buy x pencils, write an expression for the total cost. If you buy 12 pencils, how much do you spend?

• $10.50

• $8.00

• $6.00

• $4.00

Maria has 3 times as many marbles as John. If John has y marbles, write an equation to represent the number of marbles Maria has. If John has 5 marbles, how many does Maria have?

• 15

• 10

• 25

• 20

A car rental company charges a flat fee of $20 plus $0.15 per mile driven. Write an equation for the total cost C if you drive m miles. What is the total cost if you drive 100 miles?

• $20

• $50

• $75

• $35

The perimeter P of a rectangle is given by the formula P = 2l + 2w, where l is the length and w is the width. If the length is 10 meters and the width is w, write an equation for the perimeter. What is the perimeter if the width is 5 meters?

• 30 meters

• 35 meters

• 25 meters

• 20 meters

A recipe requires 2 cups of flour for every 3 cups of sugar. Write an expression for the amount of flour needed if you use s cups of sugar. How much flour is needed for 9 cups of sugar?

• 10 cups of flour

• 8 cups of flour

• 4 cups of flour

• 6 cups of flour

A school is planning a field trip and needs to rent buses. Each bus can hold 40 students. Write an equation to find the number of buses b needed for n students. How many buses are needed for 150 students?

• 4

• 6

• 5

• 3

The sum of a number x and 15 is equal to 50. Write an equation to find x. What is the value of x?

• 25

• 40

• 30

• 35

A swimming pool is being filled with water at a rate of 5 gallons per minute. Write an expression for the total gallons of water W after t minutes. How many gallons will be in the pool after 30 minutes?

• 75 gallons

• 200 gallons

• 150 gallons

• 100 gallons

A book costs $12 and a magazine costs $5. If you buy b books and m magazines, write an expression for the total cost. What is the total cost if you buy 2 books and 3 magazines?

• 39

• 45

• 30

• 25

The length of a rectangle is twice its width. If the width is w, write an equation for the length. What is the length if the width is 4 meters?

• 8 meters

• 6 meters

• 10 meters

• 12 meters