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EGR ratio=(EGR mass flow rate)/(intake mass flow rate) is equal to (intake CO2 concentration (ppm))/(exhaust CO2 concentration (ppm)) how they both can be considered equal?

EGR ratio=(EGR mass flow rate)/(intake mass flow rate) is equal to (intake CO2 concentration (ppm))/(exhaust CO2 concentration (ppm)) how they both can be considered equal? any assumptions?

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