Przeciętny orzeł waży 1,68 kg, a przeciętny wróbel - 25 g. Mózg orła waży 14 g, a mózg wróbla - 1 g. Oblicz, jakim procentem mas
y każdego z tych ptaków jest masa jego mózgu.
1 answer:
Answer:
Eagle - 0.83%
Sparrow - 4%
Step-by-step explanation:
1. On average, the weight of the eagle is 1.68 kg. Its head weighs 14 g.
Then
1.68 kg = 1,680 g - 100%
14 g - x%
Write a proportion:
![\dfrac{1,680}{14}=\dfrac{100}{x}](https://tex.z-dn.net/?f=%5Cdfrac%7B1%2C680%7D%7B14%7D%3D%5Cdfrac%7B100%7D%7Bx%7D)
Cross multiply:
![1,680x=1,400\\ \\x=\dfrac{1,400}{1,680}=\dfrac{70}{84}=\dfrac{10}{12}=\dfrac{5}{6}\approx 0.83\%](https://tex.z-dn.net/?f=1%2C680x%3D1%2C400%5C%5C%20%5C%5Cx%3D%5Cdfrac%7B1%2C400%7D%7B1%2C680%7D%3D%5Cdfrac%7B70%7D%7B84%7D%3D%5Cdfrac%7B10%7D%7B12%7D%3D%5Cdfrac%7B5%7D%7B6%7D%5Capprox%200.83%5C%25)
2. On average, the weight of the sparrow is 25 g. Its head weighs 1 g.
Then
25 g - 100%
1 g - x%
Write a proportion:
![\dfrac{25}{1}=\dfrac{100}{x}](https://tex.z-dn.net/?f=%5Cdfrac%7B25%7D%7B1%7D%3D%5Cdfrac%7B100%7D%7Bx%7D)
Cross multiply:
![25x=100\\ \\x=\dfrac{100}{25}=4\%](https://tex.z-dn.net/?f=25x%3D100%5C%5C%20%5C%5Cx%3D%5Cdfrac%7B100%7D%7B25%7D%3D4%5C%25)
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