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1 x
9 x + 400
En cruz 1 * (x+400) ÷ x = 9 ⇒
(x+400)÷ x = 9 ⇒
x/x + 400/x = 9 ⇒
1 + 400/x = 9 ⇒
400/x = 9 - 1 ⇒
400/x = 8 ⇒
400 = 8x ⇒
400/8 = x ⇒ 50 = x
Efectivamente Diana ahorro 50 y Guillermo ahorro 450.
Ojo, 450 es 9 veces 50.