Solve this Simple Math Puzzle

This is a very Simple Math Puzzle for Kids. This missing number puzzle needs to be solved as quickly as possible. In this simple picture puzzle, there are some numbers which relate to each other. Study the pattern of these numbers carefully to find out the value of the missing number.
3 6 12  4 8 16   5 10 ??
Can you solve this Simple Math Puzzle?
Answer of this "Simple Math Puzzle", can be viewed by clicking on the answer button.

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