x - cena baterii x+10 - cena latarki
x+x+10 = 15
2x + 10 = 15
2x = 15-10
2x = 5
x = 2,5
x+10 = 12,5
Odp. Latarka kosztuje 12,50zł
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x - cena baterii x+10 - cena latarki
x+x+10 = 15
2x + 10 = 15
2x = 15-10
2x = 5
x = 2,5
x+10 = 12,5
Odp. Latarka kosztuje 12,50zł