SOLUTION: Johnny left his office and took the elvator down 4 floors to the cafeteria. He then went up 21 floors to the meeting on the 28th floor. Where is Johnny's office located ?

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Question 540697: Johnny left his office and took the elvator down 4 floors to the cafeteria. He then went up 21 floors to the meeting on the 28th floor. Where is Johnny's office located ?
Found 2 solutions by oberobic, josmiceli:
Answer by oberobic(2304) About Me  (Show Source):
You can put this solution on YOUR website!
J = Johnny's floor
.
J-4 = cafeteria's floor
.
J-4+21 = 28
.
J = 28 +4 -21 = 11
.
Johnny's floor is the 11th floor.

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let f = Johnny's floor
given:
+f+-+4+ = cafeteria
+f+-+4+%2B+21+ = meeting at 28th floor
+f+%2B+17++=+28+
+f+=+11+
He is on the 11th floor