Răspuns :
a+b = 2700 inmultim cu 5
80%·a + 50% ·b=1710
80 a + 50b = 171000
8a + 5b= 17100
5a +5b=13500 le scadem
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3a= 3600 a= 1200
b= 1500
b) 1200 / 40 = 1500 / 50
30 = 30
80%·a + 50% ·b=1710
80 a + 50b = 171000
8a + 5b= 17100
5a +5b=13500 le scadem
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3a= 3600 a= 1200
b= 1500
b) 1200 / 40 = 1500 / 50
30 = 30
80a/100+50b/100=1710
80a+50b=171000
a+b=2700, a=2700-b inlocuim in 80(2700-b)+50 b=171000, 216000-80b+50b=171000, 45000=30b, b=1500 , a=1200
1200/40=1500/50=30