Question

It takes 63 minutes for 4 people to paint 9 walls. How many minutes does it take 7 people to paint 4 walls

Answer 1

Answer:

12MINUTES

Step-by-step explanation:

(M1*H1*D1)/W1 = (M2*H2*D2)/W2

MEN1= 3, HOURS1 =63 MIN, WORK1= 9WALLS

MEN2=7 HOURS2 =x MIN WORK2 =4WALLS

(3*63)/9 = (7*X)/4

X=12MIN

Answer 2

Answer:

7 people will take 16 minutes to paint 4 walls

Step-by-step explanation:

Since, when $x_1$ persons complete a kind of $w_1$ work in $n_1$ time and the same kind of $w_2$ work is completed by $x_2$ persons in $n_2$ time,

Then,

$\frac{x_1\times n_1}{w_1}=\frac{x_2\times n_2}{w_2}$

Here,

$x_1=4, n_1 = 63, w_1=9, x_2=7, w_2 = 4$

By substituting the values,

$\frac{4\times 63}{9}=\frac{7\times n_2}{4}$

$4\times 252 = 63n_2$

$\implies n_2=\frac{4\times 252}{63}=4\times 4=16$

Hence, 7 people will take 16 minutes to paint 4 walls

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