In one

A panel building has 13 floors and 7 entrance stairwells. In each stairwell, each of the first nine floors has 2 three-room apartments and 1 two-room apartment, and each of the remaining four floors has 1 four-room apartment and 2 two-room apartments. Calculate the total number of apartments in the building, and how many of them are four-room, three-room, and two-room.

Final Answer:

t =  273
a =  28
b =  126
c =  119

Step-by-step explanation:

n=7 a=n (4 1)=7 (4 1)=28 b=n (9 2)=7 (9 2)=126 c=n (9 1+4 2)=7 (9 1+4 2)=119  t=a+b+c=28+126+119=273



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