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A sample of seawater contains 6.0277g sodium chloride per liter of solution. How many mg of salt would be found in 15.0 ml of seawater?
Solve. A mechanic earns $20 an hour, but 25% of his earnings are deducted for taxes and various types of insurance. What is the least number of hours the mechanic must work in order to have no less than $450 in after-tax income?
There are three exams in a marking period. A student received grades of 75 and 81 on the first two exams. What grade must the student earn on the last exam to get an average of no less than 80 for the marking period?
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