Mastering Arithmetic Series: Identify & Calculate Differences

A farmer plants a row of trees. The first tree is planted 2 meters from the fence, and each subsequent tree is planted 3 meters apart. If he plants 10 trees, how far is the last tree from the fence?

• 25 meters

• 29 meters

• 32 meters

• 20 meters

In a school, the number of students in each grade increases by 5 each year. If there are 20 students in 7th grade this year, how many students will there be in 10th grade three years from now?

• 40

• 35

• 30

• 25

A book club reads a certain number of pages each week. They start with 10 pages in the first week and increase the number of pages by 4 each week. How many pages will they read in the 6th week?

• 22 pages

• 30 pages

• 26 pages

• 34 pages

A concert hall has rows of seats where the first row has 15 seats, and each subsequent row has 2 more seats than the previous one. How many seats are there in the 8th row?

• 27

• 29

• 25

• 31

A runner completes a lap in 4 minutes and decreases his time by 30 seconds for each subsequent lap. If he runs 5 laps, what will be his time for the last lap?

• 4 minutes

• 2 minutes

• 1 minute

• 3 minutes

A staircase has steps that are 5 inches high. If the first step is 10 inches from the ground and each step increases by 5 inches, how high is the 7th step from the ground?

• 40 inches

• 35 inches

• 25 inches

• 30 inches

A company gives a bonus that starts at $100 and increases by $25 each year. How much will the bonus be in the 5th year?

• 200

• 150

• 225

• 175

A library has a collection of books that increases by 12 books each month. If they start with 50 books, how many books will they have after 6 months?

• 122

• 95

• 130

• 110

A gardener plants flowers in a row, starting with 8 flowers and adding 3 more flowers each week. How many flowers will he have planted after 5 weeks?

• 18

• 30

• 23

• 15

A savings account earns $50 in interest the first year and increases by $10 each subsequent year. How much interest will the account earn in the 4th year?

• $80

• $100

• $90

• $70