Assertion: balloon's envelope | /r/HasProperty | × 135
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Source sentences:
text: 100,000 cu ft (2,800 m3) envelope 250 113.4 3.3% 5-passenger basket 140 63.5 1.9% double burner 50 22.7 0.7% 3 20-gallon (75.7-liter) fuel tanks full of propane 3 × 135 = 405 183.7 5.4% 5 passengers 5 × 150 = 750 340.2 10.0% sub total 1595 723.5 21.2% 100,000 cu ft (2,800 m3) of heated air 5922 2686.2 78.8% total (3.76 tons) 7517