Martha

Martha likes to walk in the park, the park is square, 7/10 mi on each side. One morning Martha walked around the entire park 3 1/2 times before stopping to rest. How far had she walked?

Result

x =  9.8 mi

Solution:

a=7/10=710=0.7 mi o=4 a=4 0.7=145=2.8 mi  k=3+12=72=3.5  x=k o=3.5 2.8=495=9.8 mia=7/10=\dfrac{ 7 }{ 10 }=0.7 \ \text{mi} \ \\ o=4 \cdot \ a=4 \cdot \ 0.7=\dfrac{ 14 }{ 5 }=2.8 \ \text{mi} \ \\ \ \\ k=3+ \dfrac{ 1 }{ 2 }=\dfrac{ 7 }{ 2 }=3.5 \ \\ \ \\ x=k \cdot \ o=3.5 \cdot \ 2.8=\dfrac{ 49 }{ 5 }=9.8 \ \text{mi}



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