Martin

Martin is making a model of a Native American canoe. He has 5 1/2 feet of wood. He uses 2 3/4 feet for the hull and 1 1/4 feet for a paddle. How much wood does he have left? Martin has feet of wood left.

Correct result:

x =  1.5 ft

Solution:

$$\begin{gathered} a=5{\displaystyle \frac{1}{2}}={\displaystyle \frac{5\cdot 2+1}{2}}={\displaystyle \frac{11}{2}}=5.5\text{ ft } \\ b=2{\displaystyle \frac{3}{4}}={\displaystyle \frac{2\cdot 4+3}{4}}={\displaystyle \frac{11}{4}}=2.75\text{ ft } \\ c=1{\displaystyle \frac{1}{4}}={\displaystyle \frac{1\cdot 4+1}{4}}={\displaystyle \frac{5}{4}}=1.25\text{ ft } \\ x=a-b-c=5.5-2.75-1.25={\displaystyle \frac{3}{2}}={\displaystyle \frac{3}{2}}\text{ ft}=1.5\text{ ft} \end{gathered}$$

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