Multiple choice

Find the missing number in the following series. 7.5 10 12.5 (?) 17.5

  1. 05

  2. 25

  3. 15

  4. 16

  5. 18
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C Correct answer
Explanation

The series is an arithmetic progression with a common difference of 2.5. 7.5 + 2.5 = 10, 10 + 2.5 = 12.5, 12.5 + 2.5 = 15, 15 + 2.5 = 17.5.

AI explanation

The numbers in this sequence increase by a constant value of 2.5. Starting from 7.5, adding 2.5 gives 10, and adding 2.5 again gives 12.5. The next term is found by adding 2.5 to 12.5, which gives 15. The missing number is 15.

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