Final answer:
The absorbance readings of the standard and the unknown are 0.30 and 0.20, respectively. The lower absorbance reading of the unknown indicates a lower concentration of glucose compared to the standard.
Step-by-step explanation:
The absorbance readings of the standard and the unknown are given as 0.30 and 0.20, respectively. Absorbance is directly proportional to the concentration of the substance being measured. In this case, glucose is being measured. As the absorbance reading of the unknown is lower than that of the standard, it means the concentration of glucose in the unknown solution is lower than the concentration in the standard solution.