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80kg-100%
x-12,5%
x=80kg*12,5%/100% = 10 kg
90kg-100%
x-10%
x=90kg*10%/100% = 9 kg
90-9=81 kg
Odp. Pan Karol waży teraz 81 kg.
90% × 90 = 81 kg (waga teraz)
xkg - 12,5%
x = 80*12,5/100
x = 10
80kg + 10kg = 90kg
90kg - 100%
xkg - 10%
x = 90*10/100
x = 9
90kg - 9kg = 81kg
Odp: Teraz waży 81kg.