Question

melania walked her dogs 2 1/5 miles cathay walked her dog 1 3/4 times as far as Melania how many more miles did Cathay walk her dog

Answer 1

first off, let's keep in mind that a "whole" is a 1 unit, namely, same/same, in this case, we can say that four fourths is one whole, namely 4/4 is 1 whole.

so, we know Melania walked her dog 2 and 1/5 miles, that'd be a whole, or 4/4.

we also know that Cathay walks hers 1 and 3/4 of that, hmmmm let's convert both fractions to "improper" and take it from there.


`\bf \begin{array}{lccll} &miles&\stackrel{whole}{fraction}\\ &\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ Melania&2(1)/(5)&(4)/(4)\\\\ Cathay&x&1(3)/(4) \end{array}\implies \cfrac{2(1)/(5)}{x}=\cfrac{(4)/(4)}{1(3)/(4)}\implies \cfrac{(2\cdot 5+1)/(5)}{x}=\cfrac{(4)/(4)}{(1\cdot 4+3)/(4)}`


`\bf \cfrac{(11)/(5)}{(x)/(1)}=\cfrac{(4)/(4)}{(7)/(4)}\implies \cfrac{11}{5}\cdot \cfrac{1}{x}=\cfrac{4}{4}\cdot \cfrac{4}{7}\implies \cfrac{11}{5x}=\cfrac{4}{7}\implies 77=20x \\\\\\ \cfrac{77}{20}=x\impliedby \textit{Cathay does that many miles, what's their \underline{difference}?} \\\\\\ \stackrel{Cathay}{\cfrac{77}{20}}~~-~~\stackrel{Melania}{\cfrac{11}{5}}\impliedby \stackrel{LCD}{20}\implies \cfrac{77-44}{20}\implies \cfrac{33}{20}\implies 1(13)/(20)`

Answer 2

Melanie walked her dog 3 17/20 more miles than Cathay