g + i = 100 ( g = gaini; i = iepuri )
2 × g + 4 × i = 240
g + i = 100 l x 2
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2 × g + 4 × i = 240
2 × g + 2 × i = 200
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/ 2 × i = 40
40 : 2 = 20 iepuri
100 - 20 = 80 gaini
V: 80 × 2 + 20 × 4 = 160 + 80 = 240 picioare