Multiple choice general knowledge math & puzzles

Look at this series: 664, 332, 340, 170, __, 89, . . . What number should fill the blank?

  1. 85

  2. 178

  3. 65

  4. 710
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The pattern alternates between dividing by 2 and adding 8. 664 ÷ 2 = 332, 332 + 8 = 340, 340 ÷ 2 = 170, so next is 170 + 8 = 178. Verifying: 178 ÷ 2 = 89, which matches the next number.

AI explanation

The series alternates between two operations: divide by 2, then add 8. Starting from 664: 664÷2=332, 332+8=340, 340÷2=170, 170+8=178, 178÷2=89. So the missing term, obtained by adding 8 to 170, is 178, which also checks out because dividing it by 2 correctly gives the next listed term, 89.

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