Mastering Two-Step Equations and Inverse Operations

A book costs $15. If you have $x and you buy the book, you have $5 left. How much money did you have initially?

• 20

• 30

• 25

• 10

In a classroom, there are 20 students. If 4 students leave, the number of students remaining is represented by the equation x - 4 = 16. How many students were there before?

• 18

• 16

• 24

• 20

A box contains x candies. If you eat 5 candies and there are 10 left, how many candies were in the box originally?

• 15

• 10

• 20

• 25

Tom has twice as many marbles as Jerry. If Jerry has x marbles and Tom has 18 marbles, how many marbles does Jerry have?

• 15

• 12

• 6

• 9

A shirt costs $25. If you have $x and you spend $10 on the shirt, you have $15 left. How much money did you have before buying the shirt?

• 20

• 30

• 15

• 25

The total number of books in a library is x. If 30 books are added and the total becomes 100, how many books were there initially?

• 90

• 70

• 60

• 80

A gardener has x flowers. If he plants 10 more flowers and now has 50 flowers, how many flowers did he start with?

• 30

• 20

• 40

• 50

Lisa has 5 more than twice the number of stickers that Mark has. If Mark has x stickers and Lisa has 25 stickers, how many stickers does Mark have?

• 5

• 10

• 15

• 20

A toy costs $40. If you have $x and you buy the toy, you have $20 left. How much money did you have before buying the toy?

• 80

• 70

• 50

• 60