How many \(4\frac{1}{2} \text { gallons }\) cans worth of gas would you need to pour into an empty 19 gallon tank to fill it exactly halfway?

\(2\)

Explanation

calculate how many gallons of gas are needed to fill a 19 gallon tank halfway:  \(19 \div 2 = 9\frac{1}{2} \text { gallons }\) .
, calculate how many \(4\frac{1}{2} \text { gallon }\) cans are needed to reach \( 9\frac{1}{2} \text { gallons }\)
\(9\frac{1}{2} \div 4\frac{1}{2} = \frac{{18}}{2} \div \frac{9}{2} = \frac{{18}}{2} \times \frac{2}{9} = \frac{{18}}{9} = 2\)

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