A portable computer drive has enough kilobytes of storage space to store 2000 photos. Each photo is 1.5 kilobytes in size. How many 200-kilobyte videos can it store if it already has 400 photos on it?
The drive has 1.5 * 2000 = <T>multiply(1.5, 2000)=3000.0 kilobytes of storage space.
It already has 1.5 * 400 = <T>multiply(1.5, 400)=600.0 kilobytes of storage space taken up.
Thus, it has 3000 - 600 = <T>subtract(3000, 600)=2400 kilobytes of space left.
The portable drive can store 2400 / 200 = <T>divide(2400, 200)=12.0 200-kilobyte videos on it with 400 photos.
