In truth, no-one can tell you quite how the Typhoon figures for aircraft and squadrons add up, because neither is the planned number.
It should have been 232 aircraft for seven squadrons.
Seven squadrons for UK AD (then seven squadrons) and to replace the three squadrons of Jaguars.
232 aircraft for seven squadrons because you need:
137 frontline jets:
Seven squadrons with 15 aircraft each, (105 aircraft)
OCU with 24 aircraft
OEU with 4 aircraft
and four aircraft in the Falklands.
Nine further aircraft were categorised as in-use reserves (one per squadron, two with the OCU), and the remaining 84 were to have been rotated in and out of service to balance flying hours across the whole fleet and to serve as an attrition reserve. Plus two IPAs.