Multiple choice

Directions: Find the missing number in the given series. 145, 110, 82, 61, 47, ___

  1. 33

  2. 40

  3. 45

  4. 38

  5. 35
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

145 - 110 = 35. 110 - 82 = 28. 82 - 61 = 21. 61 - 47 = 14. The differences are 35, 28, 21, 14 (multiples of 7). The next difference should be 7. 47 - 7 = 40.

AI explanation

The series is formed by successively subtracting decreasing multiples of nine, starting with 27, which is shown as 145 - 35 = 110, 110 - 28 = 82, 82 - 21 = 61, and 61 - 14 = 47. Since the subtractions decrease by 7 each time (35, 28, 21, 14), the next number to subtract is 7. Subtracting 7 from 47 gives the final result of 40.

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