Răspuns:
240kg z....100l u....1.560 lei
300kg z....200l u....1560+840
1560+840=2400lei
240kg z....100l u....1560lei/×2
300kg z....200l u....2400lei
480kg z....200l u....3120 lei
300kg z....200l u....2400 lei
480-300=180 kg zahar
3120-2400=720
720:180=4 lei (un kg zahar)
4×300=1200
2400-1200=1200
1200:200=6 lei (un litru de ulei)