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satela [25.4K]
3 years ago
9

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.
Mathematics
1 answer:
suter [353]3 years ago
6 0

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}

Cross multiply:

1,680x=1,400\\ \\x=\dfrac{1,400}{1,680}=\dfrac{70}{84}=\dfrac{10}{12}=\dfrac{5}{6}\approx 0.83\%

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}

Cross multiply:

25x=100\\ \\x=\dfrac{100}{25}=4\%

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