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V = 25 * 10 * 3 = 750 m szes.
gęstość wody d = 1g/cm szes= 1t/m sześ
a)
x - ilosc dodanej soli
8/1000(x + 750) = x
8( x + 750) = 1000x
8x - 1000x = - 6000
- 992 x = - 6000
x = 6 ton
b)
x - ilość dodanej soli
0.035 (x + 750) = x
35( x+750) = 1000x
35 x + 26250 = 1000x
x = 27 ton
.................................................
a)
x - ilośc wody
1 * 6% = ( x+ 1) * 5% mnożę stronami przez 100
1 * 6 = ( x+ 1) * 5
6 = 5x + 5
5x = 1
x= 1/5
x = 0,2 litra
b)
x- ilosc octu 3%
x* 0.03 + 1 * 0,06 = (x +1) * 0,05
3x + 6 = ( x+1) *5
3x + 6 = 5x + 5
-2x = -1
x = 0,5 litra