Question 40 - Mathematics Practice Test for the HiSET Test

An oil storage facility has 30 tanks. Some hold 20,000 gallons and others hold 15,000 gallons. If the total storage capacity is 510,000 gallons, how many 20,000 gallon tanks are there?

\[12\]
\[18\]
\[20\]
\[10\]

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