Question 159563
X= concentration of pollutant #1

Y=concentration of pollutant #2=4X

X+Y=4.0
X+4X=4.0
5X=4.0
X=.8
Concentration of pollutant #1=0.8 ppm
Concentration of pollutant #2=3.2 ppm

Plug into the original equation

0.8+3.2=4.0 PPM