Răspuns:
Explicație pas cu pas:
d = distanta de parcurs
prima zi 32d/100
rest d - 32d/100 = 100d/100 - 32d/100 = 68d/100
a doua zi 68d/100*25/100 = 17d/100
32d/100 + 17d/100 + 3 = d/2
49d/100 + 3 = 50d/100
50d/100 - 49d/100 = 3
d/100 = 3
d = 3*100 = 300 km
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Verificare
prima zi 300*32/100 = 96 km
rest 300 - 96 = 204 km
a doua zi 204*25/100 = 51 km
primele doua zile 96 + 51 = 147 km
147 + 3 = 150 km
jumatate din distanta 300 : 2 = 150 km