Odpowiedzi

Najlepsza Odpowiedź!
2009-11-16T21:41:03+01:00
4/100 = x/y * 100/1
4/100 = 100x/y
4y = 10000x / 4
y = 2500x

10/100 = x/y-3 * 100/1
10/100 = 100x/y-3
10y - 30 = 10000x
10 * 2500x - 30 = 10000x
25000x - 10000x = 30
15000x = 30 / 15000
x = 1/500

y = 2500x
y = 2500 * 1/500
y = 5

y-3 = 2kg

Odp: Masa wynosi 2 kg

b)
2/100 = x/9 * 100/1
2/100 = 100x/9
18= 10000x/ 10000
x = 18/10000

10/100 = x+y/9+y * 100/1
10/100 = 100x+y/9y
90 + 10y = 10000x + 100y
10y - 100y = 10000 * 18/10000 - 90
-90y = -72 / -90
y = 0,8

Odp: Trzeba dosypać 0,8 kg soli