15000.00 = 15000
You have asked two, possibly three different questions.
If you mean: What is 15000, subtract a third?
15000 - 1/3
15000 - 0.3333 (3's forever)
14999.66666 (6's forever)
Answer: 14999 2/3
If you mean: What is 15000, subtract a third of 15000?
15000 - (1/3)(15000)
15000 - 5000
Answer: 10000
If you mean: What's a third of 15000?
(1/3)(15000)
Answer: 5000