Answer:
6 hours.
Step-by-step explanation:
Number of people N is inversely proportional to the number of hours H for painting, that is
N = k / H, when N = 3 (Nancy and two friends) and H = 4 hours
k = NH
k = 3 × 4
k = 12.
Therefore,
N = 12/ H and
H = 12 / N then when N = 2 ( Nancy and one friend)
H = 12 / 2
H = 6
Hence, it will take Nancy and one of her friend to paint her living room and dining room for 6 hours.
