Respuesta :

gustanika
The new mixture is acquired from the sum of the concentration divided by the total number of gallons. Or we could write it like this.
mix = [tex] \cfrac{\text{concentrate} \times gallons+\text{concentrate} \times gallons}{\text{the total number of gallons}} [/tex]

Input the numbers
mix = [tex] \cfrac{50 \% \times 3+30 \% \times 9}{3+9} [/tex]

simplify the dividend and divisor
mix = [tex] \cfrac{150 \%+270 \%}{12} [/tex]
mix = [tex] \cfrac{420 \%}{12} [/tex]
mix = [tex] \cfrac{420 \%}{12} [/tex]
mix = 35%

The new concentration is 35%
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