Question

A x 4 = E B ÷ 4 = E C + 4 = E D - 4 = E ___________ & A + B + C + D = 100 Challenge *what is the value of E ?*

Answer 1

Given:
A×4  = E ⇒ A = E/4
B/4   = E ⇒ B = 4E
C+4  = E ⇒ C = E=4
D-4   = E ⇒ D = E+4

and also given that 
A+B+C+D=100. ---------- 1

In order to get the value of E, change eqn 1 to the variable E using the above data.

⇒ E/4 + 4E + E-4 + E+4 = 100
⇒ E/4 + 4E + 2E = 100
⇒ E/4 + 6E = 100
⇒ {E+24E}/4 = 100
⇒ E+24E = 100×4
⇒ 25E = 400
⇒ E = 400/25

∴ E = 16

Answer 2

Please refer the pic for answer . Thanks !

Hope it helps :-)