100dag = 1kg0,5 kg = m <=> 50 dag = m0,25kg= m + 7 <=> 25 dag = m+ 7 25 dag = 2(m+7) = 2m +14 50dag + 25dag +25 dag = m+ m +7 +2m +14 = 4m +21 <=> 100dag =4m+21100dag - 4m+2110 dag - x x= (40m+210)/100odp : 10 dag mieszanki herbaty kosztuje (40m+210)/100 złotych
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100dag = 1kg
0,5 kg = m <=> 50 dag = m
0,25kg= m + 7 <=> 25 dag = m+ 7
25 dag = 2(m+7) = 2m +14
50dag + 25dag +25 dag = m+ m +7 +2m +14 = 4m +21 <=> 100dag =4m+21
100dag - 4m+21
10 dag - x
x= (40m+210)/100
odp : 10 dag mieszanki herbaty kosztuje (40m+210)/100 złotych