human
There is a 5,200 sq. ft. house and a 7,300 sq. ft. house next to each other. The smaller house is being expanded. If the new total square footage of both houses is 16,000 sq. ft., how much is the smaller house being expanded by, in sq. ft.?
assistant
What is the total square footage of the houses, originally? ** Originally, the houses are 7300+5200=<<7300+5200=12500>>12500 sq. ft. in total.
How many sq. ft. is the smaller house being expanded by? ** The smaller house will be expanded by 16000-12500=<<16000-12500=3500>>3500 sq. ft.
#### 3500