First of all, I don't like these questions, and you are most unlikely to see them in the UK exam system ..... however, for other nationalities, a definite may be ... 

 Sector time = (Climb adjustment) 3mins + 2hrs 37mins + (descent adjustment) 10 = 2hrs 50mins, or 2.833hrs

 Fuel flow at cruise (5000ft, ISA, 2300RPM) = (69.4+71.1)/2 = 70.55 PPH

 Sector fuel = (climb adjustment) 6 + (2.833 x 70.55) + (descent adjustment) 0 = 6 + 200 + 0 = 206 lbs

 So, Ramp fuel = TAXY + TRIP + RESERVE (30% of TRIP) = 10 + 206 + (30/100) x 206 = 278 lbs

 There are about 3 of these in the databank ..... once you understand what they are doing, its sort of OK!!