The diagram shows 3 hexagons with numbers at their vertices, but some numbers are invisible. The sum of the 6 numbers around each hexagon is 30. What is the number on the vertex marked with a question mark?
The diagram shows 3 hexagons with numbers at their vertices, but some numbers are invisible. The sum of the 6 numbers around each hexagon is 30. What is the number on the vertex marked with a question mark? Can you solve this? - candidate answer list

Can you solve this?

Math Topic: Logic
Grade: 5, 6

Key Word: Logic math puzzle, Math Kangaroo
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