1 window pane :
[tex]10 \dfrac{1}{2} \times 7\dfrac{1}{4} = \dfrac{21}{2} \times \dfrac{29}{4} = \dfrac{609}{8} \ in^2[/tex]
6 window panes :
[tex]\dfrac{609}{8} \times 6= \dfrac{609}{8} \times \dfrac{6}{1}= \dfrac{1827}{4}= 456\dfrac{3}{4} \ in^2[/tex]
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Answer: Total Area = 456 3/4 in²
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If it is not required to do the question in fraction, it is actually easier if we convert everything to decimals first.
10 1/2 = 10.5
7 1/4 = 7.25
1 window pane = 10.5 x 7.25 = 76.125 in²
6 window panes = 76.125 x 6 = 456.75 in²
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Answer: Total Area = 456.75 in²
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