A solution M$1$ containing $18\%$ KCI, $3\%$ K$2$SO$4$ and $79\%$ water is fed to the Mixer shown below at the rate of $150$ kg$/$hr$.$M$2$ is is the only stream from mixer to evaporator and has unknown flow rate and compositions. The compositions of the streams are as follows in mass percent.Evaporator product $($M$5)$: KCI $-17\%,$ K$2$SO$4-22\%,$ H$20-61\%.$Recycle $($M$7)$ KCI $-20\%.$M$5$ enters the crystalliser. M$6$ and M$7$ leaves the crystalliser..M$3=100\%$ KCIM$4=100\%$ H$20$M$6=100\%$ K$2$SO