Mystery Dog Heights

Algebra Level 2

Given the following measurements for the height of these dogs, which answer choice correctly orders them from shortest to tallest?

  • Zorro: 11.5 in 11.5 \textrm{ in}
  • Duke: 660.4 mm \SI{660.4}{\milli\meter}
  • Chloe: 47 cm \SI{47}{\centi\meter}
  • Xiaomei: 0.625 ft 0.625 \textrm{ ft}
Xiaomei, Zorro, Chloe, then Duke Chloe, Xiaomei, Duke, then Zorro Zorro, Chloe, Xiaomei, then Duke Duke, Zorro, Xiaomei, then Chloe

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2 solutions

Danielle Scarano Staff
Jun 28, 2018

The heights of these dogs are in very different units. Our only solution is to convert the height of each of the dogs to a shared unit so that we can compare them. For example, we can convert all of the dogs' heights to inches.

We convert Chloe's height to inches as follows:

If we convert the heights of the other dogs to inches their heights become:

  • Zorro: 11.5 in 11.5 \textrm{ in}
  • Duke: 660.4 mm 26 in \SI{660.4}{\milli\meter} \ce{->} 26 \textrm{ in}
  • Chloe: 47 cm 18.48 in \SI{47}{\centi\meter} \ce{->} 18.48 \textrm{ in}
  • Xiaomei: 0.625 ft 7.5 in 0.625 \textrm{ ft} \ce{->} 7.5 \textrm{ in}

We can then rearrange the dogs in order of smallest to largest as follows:

  • Xiaomei: 7.5 in 7.5 \textrm{ in}
  • Zorro: 11.5 in 11.5 \textrm{ in}
  • Chloe: 18.48 in 18.48 \textrm{ in}
  • Duke: 26 in 26 \textrm{ in}

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1 inch = 25.4 mm

1 cm = 10 mm

12 inches = 1 ft

Since Zorro is the first on the list and Zorro's height is in inches, convert the heights of the other dogs to inches.

D u k e : 660.4 m m ( 1 i n c h 25.4 m m ) = 26 i n c h e s Duke: 660.4~mm \left(\dfrac{1~inch}{25.4~mm}\right)=26~ inches

C h l o e : 47 c m ( 10 m m 1 c m ) ( 1 i n 25.4 m m ) 18.5 i n c h e s Chloe: 47~cm \left(\dfrac{10~mm}{1~cm}\right)\left(\dfrac{1~in}{25.4~mm}\right) \approx 18.5~inches

X i a o m e t : 0.625 f t ( 12 i n 1 f t ) = 7.5 i n c h e s Xiaomet: 0.625~ft\left(\dfrac{12~in}{1~ft}\right) = 7.5~inches

So the arrangement from shortest to tallest is

X i a o m e t , Z o r r o , C h l o e Xiaomet, Zorro,Chloe then D u k e Duke .


Marvin

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