Refer to figure.
We first must convert USG into litres, litres into kilograms and, thereafter, Kilograms (kg) into Pounds (lb):
(1) US Gallons to Litres (l) => US Gal × 3.785

• 150 USG x 3.785 = 567.75 litres

(2) Conversion between Fuel volume and mass: Fuel volume in litres x Specific Gravity (density) = Fuel Mass in Kg

• 567.75 litres x 0.75 = 425.82 kg

(3) Kilograms (kg) to Pounds (lb) => kg × 2.205

• 425.82 kg x 2.205 = 938.9 lb

This question can also be solved using a CRP5 or other navigation computer. Line up the 15 on the inner wheel with the “US. Gal” marker on the outer wheel. This represents 150 US GAL. Now line up the cursor with the Sp. G of 75 over the “lbs” marking on the outer wheel. Read off 937.5 lb on the inner wheel (or 9.375).

Note: You will still need to conduct a rough calculation to know that this is 937.5 lbs, as opposed to 93.75 or 9375 lbs.