Answer:
sample 3:9
Step-by-step explanation:
hope this helps
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Answer:
none
Step-by-step explanation:
8-4=4
if every 2 years, 4 gallons disappear
then every 1 year, 2 gallons disappear
meaning that by 5 years there will be no substance left.
(5*2=10)
You can do it in multiple ways but mine is.... 140+120-160=180