Answer:
7 people will take 16 minutes to paint 4 walls.
Step-by-step explanation:
Since, if [tex]x_1[/tex] people take [tex]n_1[/tex] times for [tex]w_1[/tex] work and in the same kind of work [tex]x_2[/tex] people take [tex]n_2[/tex] time for [tex]w_2[/tex] work,
Then,
[tex]\frac{x_1\times n_1}{w_1}=\frac{x_2\times n_2}{w_2}[/tex]
Here, [tex]x_1=4[/tex], [tex]n_1=63[/tex], [tex]w_1=9[/tex],
[tex]x_2=7[/tex], [tex]w_2=4[/tex]
By substituting the values in the above formula,
[tex]\frac{4\times 63}{9}=\frac{7n_2}{4}[/tex]
By the cross multiplication,
[tex]1008=63n_2[/tex]
[tex]\implies n_2=\frac{1008}{63}=16[/tex]
Hence, 7 people will take 16 minutes to paint 4 walls.
