Look at this series: 80, 10, 70, 15, 60, ... What number should come next? 20 25

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Question
Look at this series: 80, 10, 70, 15, 60, ... What number should come next?
Options
A. 20
B. 25
C. 30
D. 50

Correct Answer

20

Explanation

This is an alternating addition and subtraction series. In the first pattern, 10 is subtracted from each number to arrive at the next. In the second, 5 is added to each number to arrive at the next.

Number Series problems

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1. Look at this series: 544, 509, 474, 439, ... What number should come next?
Options
A. 404
B. 414
C. 420
D. 445

2. Look at this series: 201, 202, 204, 207, ... What number should come next?
Options
A. 205
B. 208
C. 210
D. 211

3. Look at this series: 2, 4, 6, 8, 10, ... What number should come next?
Options
A. 11
B. 12
C. 13
D. 14

4. Look at this series: 14, 28, 20, 40, 32, 64, ... What number should come next?
Options
A. 52
B. 56
C. 96
D. 128

5. Look at this series: 1.5, 2.3, 3.1, 3.9, ... What number should come next?
Options
A. 4.2
B. 4.4
C. 4.7
D. 5.1

6. Look at this series: 2, 6, 18, 54, ... What number should come next?
Options
A. 108
B. 148
C. 162
D. 216

7. Look at this series: 5.2, 4.8, 4.4, 4, ... What number should come next?
Options
A. 3
B. 3.3
C. 3.5
D. 3.6

8. Look at this series: 8, 6, 9, 23, 87 , ... What number should come next?
Options
A. 128
B. 226
C. 324
D. 429

9. Which word does NOT belong with the others?
Options
A. parsley
B. basil
C. dill
D. mayonnaise

10. Which word does NOT belong with the others?
Options
A. inch
B. ounce
C. centimeter
D. yard

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