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02-12-2016
Mathematics

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A scrapyard had 200 tons of recycled steel. They sold 15 tons per day for several days. If there are fewer than 80 tons left at the scrapyard, how many days, d have passed?
A. Write and inequality to answer this question

B. Solve the inequality

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02-12-2016

A.
total-sold<80
sold=15d
200-15d<80

B.
200-15d<80
minus 200 both sides
-15d<-120
divide both sides by -15, don't forget to flip sign
d>8

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