Real-Life Equation Challenges: Solve and Identify Variables

Maria has 12 apples. She gives some to her friend and now has 5 apples left. How many apples did she give away? (Let x be the number of apples given away.)

• 4

• 3

• 10

• 7

A book costs $15. If you buy 3 books, how much do you spend in total? (Let x be the total cost.)

• $45

• $30

• $75

• $60

Tom is 4 years older than his sister. If his sister is x years old, how old is Tom? (Write an equation to find Tom's age.)

• Tom's age = x + 2

• Tom's age = x + 4

• Tom's age = 2x

• Tom's age = x - 4

A box contains x candies. If you eat 3 candies, there are 10 left. How many candies were in the box originally?

• 12

• 8

• 15

• 13

The total cost of 5 notebooks is $20. How much does each notebook cost? (Let x be the cost of one notebook.)

• $2

• $4

• $10

• $5

A car travels 60 miles per hour. How far does it travel in x hours? (Write an equation to find the distance.)

• Distance = 60 + x

• Distance = 60/x

• Distance = 60 - x

• Distance = 60x

Lily has twice as many marbles as Jake. If Jake has x marbles, how many marbles does Lily have? (Write an equation to express this relationship.)

• L = 3x

• L = x + 2

• L = x

• L = 2x

A rectangle has a length of 10 cm and a width of x cm. If the perimeter is 40 cm, what is the value of x? (Use the perimeter formula.)

• 5 cm

• 15 cm

• 20 cm

• 10 cm

You have $50. You spend x dollars on a game. How much money do you have left? (Write an equation to find the remaining amount.)

• x - 50

• 50 - 50

• 50 - x

• 50 + x

A gardener plants x flowers in each row. If there are 4 rows and a total of 32 flowers, how many flowers are planted in each row? (Set up an equation to solve for x.)

• 8

• 6

• 10

• 12