Răspuns:
Explicație pas cu pas:
a)
P = MN + NP + PM
60 = MN + 60MN/100 + 80MN/100
60 = 100MN/100 + 60MN/100 + 80MN/100
60 = 240MN/100
MN = 60*100/240 = 25 cm
NP = 25*60/100 = 15 cm
PM = 25*80/100 = 20 cm
b)
P = MN + NP + PM
63 = 75NP/100 + NP + 50NP/100
63 = 75NP/100 + 100NP/100 + 50NP/100
63 = 225NP/100
NP = 63*100/225 = 28 cm
MN = 28*75/100 = 21 cm
PM = 28*50/100 = 14 cm