There is a missing unit after the 1.75, but I guess that is 1.75 imperial pints which is approximately 1 litre, so I'll guess the question is also referring to imperial gallons (not US gallons which are smaller):
→ 1 gallon ÷ 1.75 pt = 8 pt ÷ 1.75 = 4 4/7 ≈ 4.57
1 imp gallon ≈ 4.55 litres
1 US gallon ≈ 3.79 liters
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Just convert everything to the same unit (reminder: 1 gallon = 3.785 liters), then divide.