Which one will replace the question mark ?
2023
Which one will replace the question mark ?
Answer: B. 20 — Key idea: the central number equals the sum of the four numbers surrounding the circle. First circle: 1 + 2 + 3 + 4 = 10 Second circle: 8 + 1 + 3 + 5 = 17…
- A.
18
- B.
20
- C.
21
- D.
19
Attempted by 110 students.
Show answer & explanation
Correct answer: B
Key idea: the central number equals the sum of the four numbers surrounding the circle.
First circle: 1 + 2 + 3 + 4 = 10
Second circle: 8 + 1 + 3 + 5 = 17
Third circle (missing center): 9 + 1 + 4 + 6 = 20
Therefore the missing number is 20.
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