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1/4 de tomate
2/5 de zanahoria
El resto: cebolla= 280 m²
1-(1/4+2/5)= 1-(5/20+8/20)= 1-13/20
1= 20/20
El resto es:
20-20-13/20= 7/20
Cebollas:
7/20= 280 m²
Superficie del terreno
7/20= 280
1/20= 280/7= 40
20/20= 40(20)= 800 m²
R.
La superficie del terreno es 800 m²
En 7/20 ha sembrado la cebolla.