#9) 12 in / 4 days
= 4 in / 1 day
#10) $900 / 3 weeks
= $300 / 1 week
#11) 45 lbs / 5 months
= 9 lbs / 1 month
#12) $2200 / 440 sq ft.
= $5 / 1 sq ft.
#13) 2700 sq ft. / 3 hr
= 900 sq ft. / 1 hr
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