ANSWER:
1.To reduce weight and also to avoid malfunctions
2.The source of error in the computation is airplane' fuel indication system
3.1.77 pounds per liter . Their calculation yields 4,916L
4.by using multiplication and division
5.In measuring the exact amount of liquids even materials
6.Rulers are used to measure length, balances (scales) are used to measure mass (weight), and graduated cylinders or pipettes are used to measure volume. Measurements made using these devices are expressed as quantities. A quantity is an amount of something and consists of a number and a unit
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