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100%-500ml
30%-x
x=500ml×30%/100%
x=5ml×30=150ml
proporcja
100%-500ml
12%-y
y=500ml×12%/100%
y=5ml×12=60ml
500ml+500ml=1000ml
150ml+60ml=210ml
proporcja
100%-1000ml
z-210ml
x=100%×210ml/1000ml
x=210%/10=21%
Odp. Otrzymam 21% śmietankę.
500 * 30 / 100 = 150ml
smietana2:
500 * 12 / 100 = 60ml
smietana1 + smietana2:
p - szukany procent
500 + 500 * p / 100 = 150 + 60
1000p / 100 = 210
10p = 210
p = 21
odp: uzyskam 21 procentowa smietane.
500ml × 12% = 60ml
500ml × 2 = 1000ml
210ml to 21% zmieszanej śmietanki.
Otrzymamy 21% śmietankę.