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8%=x/23+x / 100%
8(23+x)=100x
184 + 8x=100x / -8x
184= 92x
x= 2
Odp. Nalezy dodać 2 kg soli
8/100 - roztwór 23kg wody
8% x /(23+x) = 8/100
mnożymy na krzyż
8*(23+x) = 100x
184+8x=100x
100x - 8x = 184
92x= 184 x= 184/92
x=2
x - 8% x=23* 8% / 92% % skracamy
x=184 / 92
x= 2
Odp:Trzeba dodac 2kg soli