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Steve's pet parakeet is 100 mm tall. It casts a shadow that is 250 mm long. A cockatiel sitting nextto the parakeet casts a shadow that is 450 mm long, How tall is the cockatiel?

Answer :

We have the following relation

[tex]\frac{100}{250}=\frac{h}{450}\rightarrow h=450\cdot\frac{100}{250}=450\cdot\frac{2}{5}=180[/tex]

therefore the cockatiel is 180mm tall

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