Question

Dau coroana și 50 puncte! ​

Answer 1

Răspuns:

1. ms = 800g

c = 15%

md = c × ms / 100 = 15 × 800g / 100 = 120g

m(apă) = ms - md = 800g - 120g = 680g

2.

ms = 100g

md = 40g

c = md × 100 / ms = 40g × 100 / 100g = 40%

m(apă) = ms - md = 100g - 40g = 60g

3.

md = 25g

m(apă) = 225g

ms = md + m(apă) = 25g + 225g = 250g

c = md × 100 / ms = 25g × 100 / 250g = 10%

4.

ms = 60g

c = 12%

md = c × ms / 100 = 12 × 60g / 100 = 7,2g

m(apă) = ms - md = 60g - 7,2g = 52,8g

5.

m(apă) = 320g

c = 20%

c = md × 100 / ms

ms = md + m(apă)

→ c = md × 100 / (md + m(apă))

20 = md × 100 / (md + 320g)

100md = 20(md + 320g)

100md = 20md + 6400g

100md - 20md = 6400g

80md = 6400g

md = 6400g / 80

md = 80g

ms = md + m(apă) = 80g + 320g = 400g

-Mihai