Number Puzzle and Answer: Find the missing number in the Table

Number puzzles are one of the most interesting puzzle. In the above number puzzle, a table of numbers is given. In which a number is missing. Your task is to find that number by simple logic and some mathematics.

The missing number is 78
First Row: LCM(16,4)=16
Second Row: LCM(6,15)=30 where LCM is Least Common Multiple

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