Question

Przeciętny orzeł waży 1,68 kg, a przeciętny wróbel - 25 g. Mózg orła waży 14 g, a mózg wróbla - 1 g. Oblicz, jakim procentem masy każdego z tych ptaków jest masa jego mózgu.

Answer 1

Eagle - 0.83%

Sparrow - 4%

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:

`(1,680)/(14)=(100)/(x)`

Cross multiply:

`1,680x=1,400\\ \\x=(1,400)/(1,680)=(70)/(84)=(10)/(12)=(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:

`(25)/(1)=(100)/(x)`

Cross multiply:

`25x=100\\ \\x=(100)/(25)=4\%`