Which problem is not represented by the equation 20 + x = 35?

a) A cake needs 35 min in the oven. It has
been in the oven for 20 min.
bI earned 20 000 Dinars. I will get more
money so that the total amount will be
35 000 Dinars.
You are in the 20th floor. You pressed the
35th floor button.
d I bought a shirt for 20 000 Dinars and a
pair of pants for 35 000 Dinars.