Respuesta :

mayadc821
You can calculate this percentage by setting up a proportion like this.  Note that percent is the amount per 100:

[tex] \frac{3}{40} = \frac{x}{100} [/tex]

Use cross multiplication:

[tex]\frac{3}{40} = \frac{x}{100} \\ \\ 3*100 = 40*x \\ \\ 300 = 40x \\ \\ \frac{300}{40} =x \\ \\ x = 7.5[/tex]

The brain represents 7.5% of an average person's weight.

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