###Human: Kathryn moved to a new city for the new job she had landed two weeks ago. Her rent was $1200, 1/2 of what she spent on food and travel expenses in a month. Luckily, she found a new friend Shelby, who moved in with her to share the rent. If her salary was $5000 per month, how much money remained after her expenses?, ### Assistant: If the rent is half what she spends on food and travel expenses, she spends 1200*2 = $2400 on food and travel costs.
When her friend moved in and shared the rent costs with her, she started paying 1/2*1200 = $600 in rent costs.
Her total monthly expenses is now 600+2400 = $3000.
When she deducts her monthly expenses from her salary, she has $5000-$3000 = $2000 remaining. 
 So the answer is :  2000