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??