Statement of Cashflows

there is a question in bpp f7 text on cashflow statement. its a worked example. i have worked out everything but i cant understand where he gets his opening cash/cash equivalent figure

he has a figure of (97).

and while playing with numbers, the only thing i cd come up with is that he has taken the cash balance plus the bank OD.
—————————-x2——–x1
short term invest——-50——–Nil
Cash———————–2 ——- 1

under current liabilities he has:

bank OD —————-85———98

so 98-1=97

i guess if we have OD, is that always deducted from cash in hand to get the final cash figures??