Reverse Calculation

I created a following formula to convert the number of balls bowled in a match to a number of overs in that match.

Logic: 1 over = 6 balls

Whereas “bb” is the cell reference wherein we insert number of balls bowled in a match.

Formula =INT(bb/6)+(bb/6-INT(bb/6))*6/10

The formula works fine to calculate number of overs accurately i.e. 36 balls equivalent to 6 overs similarly if we put 39 balls it converts to 6.3 Overs

Now I want a formula that perform a reverse calculation to calculate number of balls for any number of overs (based on the same logic that 1 over =6 balls)