Mastering Two-Step Equations: Variable Challenge Quiz

1. Sarah has some marbles. If she buys 5 more marbles and then has 15 marbles in total, how many marbles did she start with? (Let x be the number of marbles Sarah started with.)

• 12

• 5

• 8

• 10

2. A book costs $12. If you have $20 and you buy the book, how much money will you have left? (Let y be the amount of money left.)

• $8

• $15

• $5

• $10

3. Tom is 3 years older than his sister. If the sum of their ages is 21, how old is Tom? (Let z be Tom's age.)

• 8

• 10

• 15

• 12

4. A box contains some chocolates. If you take out 8 chocolates and there are 12 left, how many chocolates were in the box originally? (Let a be the original number of chocolates.)

• 20

• 18

• 16

• 24

5. Lisa has twice as many stickers as her friend. If together they have 30 stickers, how many stickers does Lisa have? (Let b be the number of stickers Lisa has.)

• 20

• 10

• 15

• 25

6. A car rental company charges a flat fee of $50 plus $0.20 per mile driven. If you paid $70 for your rental, how many miles did you drive? (Let c be the number of miles driven.)

• 200 miles

• 150 miles

• 50 miles

• 100 miles

7. A gardener has some plants. If he buys 10 more plants and now has 50 plants, how many did he have initially? (Let d be the initial number of plants.)

• 50

• 40

• 30

• 20

8. A concert ticket costs $45. If you have $100 and buy 2 tickets, how much money will you have left? (Let e be the amount of money left.)

• $10

• $5

• $20

• $15

9. A baker made some cookies. If he sold 15 cookies and now has 25 left, how many cookies did he make in total? (Let f be the total number of cookies.)

• 30

• 50

• 40

• 35

10. A school is collecting cans for a food drive. If they have 40 cans and collect 20 more, how many cans will they have in total? (Let g be the total number of cans.)

• 50

• 60

• 70

• 80