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x 5%
x=5*80/100
x=4g
80g+20g=100g
100g 100%
4g x
x=4*100/100
x=4%
odp. stezenie otrzymanego roztowru to 4%
x to 5%
x = 80 * 5 : 100 = 4g (masa soli solance )
Roztwor drugi :
80g + 20g = 100g
100g to 100%
4g to x
x = 100 * 4 : 100 = 4%
Odp. Stężenie solanki po dolaniu 20g wody wynosi 4%.
5%-x
__________
x=80g × 5% /100%=
=400g/100=4g
80g - 4g=76g
76g+20g=96g
80g+20g=100g
100%-100g
x%-4g
____________
x=100%×4g/100g=
=400%/100=4%
0dp: Otrzymano 4% roztwór.