Multiple choice

Directions: Find the missing number in the series. 15, 20, 30, 45, ?

  1. 60

  2. 65

  3. 70

  4. 55
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B Correct answer
Explanation

The differences between consecutive terms are: 20-15=5, 30-20=10, 45-30=15. The pattern is adding multiples of 5. The next difference should be 20. 45 + 20 = 65.

AI explanation

The differences between the consecutive terms of the series are increasing multiples of 5. The difference between 15 and 20 is 5, between 20 and 30 is 10, and between 30 and 45 is 15. Following this pattern, the next difference must be 20, making the next term 45 + 20, which is 65.

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