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Old April 30, 2012, 05:17 AM
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aleCcowaN aleCcowaN is offline
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Join Date: Aug 2010
Location: Buenos Aires, Argentina
Posts: 3,127
Native Language: Castellano
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It's not wrong, but I prefer

El problema es el cuerpo de estudiantes.
El problema es el alumnado/estudiantado.
El problema son los estudiantes.

El costo mayor es el de los trabajadores.

In an informal level, son is OK and es is also OK but it sounds a bit lame (cripple) because it is elevated in the language aspect but not in the exposition of ideas.

By the way, congratulations, as this question has an educated-native speaker level.
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