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To find out how many gallons the tank holds, we can set up a proportion:
6/10 (fraction of tank used) = 9 gallons (amount used)
x (total tank capacity) = ?
Cross multiply to solve for x:
6/10 * x = 9
6x = 9 * 10
6x = 90
x = 90 / 6
x = 15
Therefore, the tank holds 15 gallons of gasoline.