Question Number 69545 by TawaTawa last updated on 24/Sep/19
Commented by mr W last updated on 24/Sep/19
$$\mathrm{30}×\mathrm{20}−\mathrm{28}×\mathrm{18}=\mathrm{96}\:{m}^{\mathrm{2}} \\ $$$$\mathrm{96}×\mathrm{0}.\mathrm{08}=\mathrm{7}.\mathrm{68}\:{m}^{\mathrm{3}} \\ $$$$\frac{\mathrm{7}.\mathrm{68}}{\mathrm{1}}=\mathrm{7}.\mathrm{68}\:\Rightarrow\:\mathrm{8}\:\:{bags} \\ $$$$\mathrm{8}×\mathrm{600}=\mathrm{4800}\:{N} \\ $$$$\mathrm{4800}+\mathrm{2000}=\mathrm{6800}\:{N} \\ $$$$\frac{\mathrm{6800}}{\mathrm{96}}=\mathrm{70}.\mathrm{83}\:{N}/{m}^{\mathrm{2}} \:\approx\:\mathrm{70}\:{N}/{m}^{\mathrm{2}} \:\Rightarrow{correct} \\ $$
Commented by TawaTawa last updated on 24/Sep/19
$$\mathrm{Wow},\:\mathrm{God}\:\mathrm{bless}\:\mathrm{you}\:\mathrm{sir} \\ $$