human
James has a room that is 13 feet by 18 feet. He increases each dimension by 2 feet. He then builds 3 more rooms of equal size and 1 room of twice that size. How much area does he have?
assistant
How long is the room? ** He increases the length to 13+2=<<13+2=15>>15 feet
How wide is the room? ** He increases the width to 18+2=<<18+2=20>>20 feet
How many square feet are the rooms? ** So the rooms are 15*20=<<15*20=300>>300 square feet
How many rooms does he have? ** So he has 1+3=<<1+3=4>>4 rooms of this size
How many square feet of rooms does he have? ** So he has 4*300=<<4*300=1200>>1200 square feet of rooms this size
How many square feet is the largest room? ** He also has one room of size 300*2=<<300*2=600>>600 square feet
How much area does he have? ** So he has 1200+600=<<1200+600=1800>>1800 square feet of rooms
#### 1800