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I.
x + y / 2 = A
II.
x = y/2
("x" es más pequeño que "y")
Reemplazamos:
y / 2 + y / 2 = A
3y / 2 / 2 = A
3y / 4 = A
y = 4A / 3
Reemplazmos "y" para sacar "x":
x = 4A / 3 / 2
x = 4A / 6
x = 2A/3
Por lo tanto, es la alternativa A) (2/3)A