Question

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

Answer 1

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