5 10 15 20
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30
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35
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25
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none
Reveal answer
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C
Correct answer
Explanation
This is an arithmetic sequence where each number increases by 5: 5, 10, 15, 20. The next number after 20 is 20+5=25. Option A (30) would skip a step, and Option B (35) would require adding 15 instead of 5.
AI explanation
The sequence increases by a constant difference of 5 each time (5, 10, 15, 20...), so the next term is 20 + 5 = 25.