Any \(3\frac{1}{2}\) gallon cans worth of gas would you need to pour into an empty 15 gallon tank to fill it exactly halfway?



calculate how many gallons of gas are needed to fill a 15 gallon tank halfway:  \(15 \div 2 = 7\frac{1}{2} \text { gallons }\). Next, calculate how many \(3\frac{1}{2} \text { gallons }\) cans are needed to reach \( 7\frac{1}{2} \text { gallons}\) :

\(7\frac{1}{2} \div 3\frac{1}{2} = \frac{{14}}{2} \div \frac{7}{2} = \frac{{14}}{2} \times \frac{2}{7} = \frac{{14}}{7} = 2\)

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