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Un'urna contiene palline nere e palline rosse. Sappiamo che:(i) il numero delle palline rosse è quattro volte quello dellenere(ii) una pallina rossa ha massa pari alla metà di una pallinaneraSapendo che la somma delle palline nere e di quelle rosse è75 e una pallina nera ha massa 2 kg, qual è la massa totaledelle palline rosse?

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