###Human: At a certain car dealership, 15% of the cars cost less than $15000 and 40% of the cars cost more than $20000. If there are 3000 cars at the dealership, how many of them cost between $15000 and $20000?, ### Assistant: 15% of 3000 cars is (15/100)*3000 = 450 cars
40% of 3000 cars is (40/100)*3000 = 1200 cars
450+1200 = 1650 cars which cost either less than $15000 or more than $20000
Out of 3000 cars, there will then be 3000-1650 = 1350 cars left which cost between $15000 and $20000 
 So the answer is :  1350