Question Number 180582 by HeferH last updated on 14/Nov/22
Answered by mr W last updated on 14/Nov/22
Commented by mr W last updated on 14/Nov/22
$${A}+{B}={A}+{C} \\ $$$$\Rightarrow{B}={C} \\ $$$${A}+{B}+{E}=\frac{{square}}{\mathrm{2}} \\ $$$${C}+{D}=\frac{{square}}{\mathrm{2}} \\ $$$$\Rightarrow{A}+{B}+{E}={C}+{D} \\ $$$$\Rightarrow{A}+{E}={D}=\frac{\mathrm{4}×\mathrm{5}}{\mathrm{2}}=\mathrm{10}\:\checkmark \\ $$