color(blue)("Using ratio")Using ratio
("miles")/("yards") ->1/1760-=("miles")/849milesyards→11760≡miles849
" "color(red)(uarr) ↑
" "color(red)("This means equivalent to") This means equivalent to
To change 1760 to 849 we multiply by 849/17608491760
color(green)([ 1/1760color(red)(xx1)] " "=" "[1/1760color(red)(xx(
color(white)(.) 849/1760 color(white)(.))/(849/1760))][11760×1] = [11760×.8491760.8491760]
" "=" "color(green)((0.48238...)/849)
849" yards" ~~0.482" miles" to 3 decimal places
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color(blue)("Shortcut method")
color(brown)("This is what the shortcut method should look like")
1/1760=("miles")/849" "->" miles"=859/1760 = 0.48283..
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color(brown)("This is why the shortcut method works")
1/1760" "=" "("miles")/849
1/1760" "=" miles" xx1/849
To get rid of the 1/849 on the right hand side of the equals sign multiply both sides by 849. It turns it into 1
color(white)(.)
849/1760="miles"xx849/849
0.48238...="miles"xx1
0.48238...=" miles"