1. The scientific experimental satellite launched by China needs 10.6 hours to orbit the earth in the air for six weeks, and how many hours does it take to run 14 weeks?

Solution: It takes x hours.

10.6:6 = X； 14

6X= 10.6× 14

X= 148.4÷6

X = 24 and 15 part 1 1.

2. A salt drying field can dry 3 grams of salt with100g seawater. According to this calculation, if you put 585,000 tons of seawater into a salt field at a time, how many tons of salt can you get out? How many tons of seawater can produce 9 tons of salt?

Solution: Suppose X tons of salt can be dried. Y tons of seawater can produce 9 tons of salt.

3: 100 = X:585000 3: 100 = 9:Y

100 x = 585000×33y = 100×9

x = 1755000÷ 100Y = 900÷3

X= 17550 Y=300