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x kg - 100%
x = 23*100/92 = 25kg
25 - 23 = 2kg
Trzeba dosypać 2kg soli.
100% - 8% = 92%
Musimy otrzymać 100% roztwór, więc układamy proporcje
23 kg to 92%
x kg to 100%
92x = 23 * 100
92x = 2300
x = 25
25 - 23 = 2kg
y = 8%x (= 0,08x)
23kg + 8%x = 100%x
23kg = 92%x ||:92%
x = 25kg
y = 0,08 * 25kg
y = 2kg