<human>:  Mark builds an apartment that is 16 by 10 feet. There are 6 rooms in total. All the rooms are the same size except the living room which is as big as 3 other rooms. How big is the living room?
<bot>: How many square feet are in the apartment? ** Total square footage is 16*10=<<16*10=160>>160 square feet
How many square feet are in the apartment? ** 
How many rooms are there? ** There are 3+3=<<3+3=6>>6 rooms
How many rooms are the same size? ** 6-1=<<6-1=5>>5 of them are the same size
How many square feet are all the rooms? ** If x is the size of the normal room then the square footage of all rooms is 5x+3x=8x
How many square feet are each room? ** So each room is 160/8=<<160/8=20>>20 square feet
How big is the living room? ** So the living room is 20*3=<<20*3=60>>60 square feet
#### 60