“…Further, the developed methods were evaluated for their greenness profile using greenness tools such as analytical eco scale and agree metrics. The principle of the simultaneous equation technique [8] is that when a sample solution includes three drugs (X, Y, and Z) with dissimilar λmax, the concentration of all the three analytes (Cx, Cy, and Cz) is calculated using a simple simultaneous equation [9] using absorptivity of X at λ1, λ2, and λ3 (ax1, ax2, ax3); the absorptivity of Y at λ1, λ2, and λ3 (ay1, ay2, ay3); and absorptivity of Z at λ1, λ2, and λ3 (az1, az2, az3) and absorbance of the sample at λ1, λ2, and λ3 (A1, A2, and A3)…”