



 
Hi Muhammed, For the first equation $A \times 4 = E,$ solve for $A$ in terms of $E.$ For the second equation $A \div 4 = E,$ solve for $B$ in terms of $E.$. Do the same for the third and fourth equations. Substitute into $A+B+C+D = 100$ and solve for $E.$ Penny  


Math Central is supported by the University of Regina and the Imperial Oil Foundation. 