Răspuns:
Explicație pas cu pas:
3 kg mere.................2 kg struguri.....................104 RON (x 2)
6 kg mere ................3 kg struguri......................183 RON
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6 kg mere.................4 kg struguri.....................208 RON
6 kg mere ................3 kg struguri......................183 RON
4 - 3 = 1 kg struguri..............208 - 183 = 25 RON
3 kg mere..................104 - 2*25 = 104 - 50 = 54 RON
1 kg mere...................54 : 3 = 18 RON