Question

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QUESTOION BELOW

Answer 1

Let u = unit rate
P = num of people
W = num of walls
T = time in minutes

\[T = u \frac{W}{P}\]
First find unit rate
\[63 = u (\frac{9}{4}) \]
\[u = 63(\frac{4}{9}) = 28\]
Now solve for T for 7 people and 4 walls
\[T = 28 (\frac{4}{7}) = 16\]

Answer 2

i solve it by unitary method.