could someone solve this by hand please??

= (3) (5 points) The chemical reaction from solution A to B takes into two steps. The governing equations are: (ACA = 7-1(CA. - CA1) kC A1, dCB1 E-T-CB1 + KC A1, dCA2 = 7-1(CA1 - CA2) kC A2, dCB2 =T-1(CB1 - CB2) + kC A2, dt = dt = dt dt where = = CA = concentration of A at the inlet of the first reactor, CA1 = concentration of A at the outlet of the first reactor (and inlet of the second), CA2 = concentration of A at the outlet of the second reactor, CB1 = concentration of B at the outlet of the first reactor (and inlet of the second), CB2 = concentration of B outlet of the second reactor. Use k = 0.12, time domain t (0,1), h = 1/4, T = 1/5. Assume that, at the starting time, CA0 = 20, and all other dependent variables are zero. Solve with Euler's method. = = =