Răspuns:
Explicație pas cu pas:
2a + b + 5c = 305 l *2 = 4a +2b + 10 c= 610
4a + 2b + 10 c= 610
a + 2b + 10c = 550
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le scadem (-)
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3a = 60
a=60:3
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a= 20
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2*20 + b+ 5c= 305
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40 + b +5c = 305 l*10
400 +10b +50c = 3050
10b+50c= 3050- 400
10b+50c= 2650
10b=3c
3c+50c=2650
53c=2650
c= 2650:53
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c= 50
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b= 3c/10
b= (3*50)/10
b= 150/10
b= 15
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deci nr sunt
a=20
b=15
c=50
