Multiple choice general knowledge math & puzzles

Take a 3 by 3 square. The first row reads: 3, 5, 8. The second one: 4, 1, 7 and the last one: 14, 12, ?? Which number is missing?

  1. 10

  2. 20

  3. 30

  4. 40
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In each row, the third number is derived from the first two. In row 1: (3+5)=8. In row 2: (4+1)=5 (but it says 7). If the logic is (Row1+Row2)*2=Row3: (3+4)*2=14, (5+1)*2=12, then (8+7)*2=30. This fits the third row values.

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