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Sagot :
[tex]w=\frac{3}{5}mi\\\\l=?\\\\A_{\fbox{ }}=w\times l;\ A_{\fbox{ }}=\frac{21}{50}mi^2\\\\\frac{3}{5}l=\frac{21}{50}\ \ \ \ \ |multiply\ both\ sides\ by\ \frac{5}{3}\\\\l=\frac{21}{50}\times\frac{5}{3}\\\\l=\frac{7}{10}\\\\Answer:\boxed{\frac{7}{10}mi=0.7mi}[/tex]
A = B*L
A = 21/50 sq miles
B = 3/5 mile
L = ? mile
L = A/B
L = (21/50)/(3/5)
* dividing by fraction is same as multiplying by it's reciprocal
L = (21/50)*(5/3)
L = (21*5)/(50*3)
L = 105/150
*divide both numerator & denominator by 5
L = 21/30
*divide both numerator & denominator by 3
L = 7/10 miles
A = 21/50 sq miles
B = 3/5 mile
L = ? mile
L = A/B
L = (21/50)/(3/5)
* dividing by fraction is same as multiplying by it's reciprocal
L = (21/50)*(5/3)
L = (21*5)/(50*3)
L = 105/150
*divide both numerator & denominator by 5
L = 21/30
*divide both numerator & denominator by 3
L = 7/10 miles
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