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Entiendo que todas las medidas son dadas em kgs
Tenemos
CEMENTO
4 x 1/2 = 2 kg
ARENA
3/2 = 1 1/2 = 1,5 kg
PIEDRA
3/6 = 1/2 = 0,5 kg
TOTAL DE MEZCLA
2 + 1,5 + 0,5 = 4 kg
Si utileza 3 kg, le sobra
4 - 3 = 1
SOBRA 1 kg