## A special symbol

*Difficulty level:*

The symbol represents a special operation with numbers. See some examples:

24 = 10

38 = 27

427 = 112

51 = 10

How much is 4(87)?

*Difficulty level:*

The symbol represents a special operation with numbers. See some examples:

24 = 10

38 = 27

427 = 112

51 = 10

How much is 4(87)?