i have a question about formatting combo boxes.

i have 1 combobox on the form with a label and a calculate button, the combo box is layed out like this 180 / 50 like a tyre size.

The calculation to be performed is the 1st number X the 2nd Number, the way the sizes are layed out they must be in a single combo box with the above format.

Can somebody please help me get delphi to calculate the 2 values.

wrote a custom procedure called split for this 1 in the end.