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Dragomiroana260
a fost răspuns

Calculati: a/60=40-a/40

Răspuns :

[tex] \frac{^{40}^)a}{60} = \frac{^{240}^)40}{1} - \frac{^{60}a}{40} ~~|*240\\\\ 40a=9600-60a\\ 40a+60a=9600\\ 100a=9600\\ a= \frac{9600}{100} \\ \boxed{a=96}[/tex]