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If 3 men can do a piece of work in 20 days, how long will it take for 12 men to do the same work?

Sagot :

Answer:

It will take 5 days for 12 men to do the same work.

Step-by-step explanation:

The number of men varies inversely as the number of days.

Let m be the number of men, and d be the number of days.

Mathematical Equation:

[tex]\LARGE\text{$m=\frac{k}{d}$}[/tex]

For the constant of variation (k):

Given:   [tex]m=3[/tex],   [tex]d=20[/tex]

Find:   [tex]k=?[/tex]

Formula:   [tex]m=\frac{k}{d}[/tex]

Solution:

[tex]m=\frac{k}{d}\\3=\frac{k}{20}\\k=(3)(20)\\\boldsymbol{k=60}[/tex]

For the number of days (d) if there are 12 men (m):

Given:   [tex]k=60[/tex],   [tex]m=12[/tex]

Find:   [tex]d=?[/tex]

Formula:   [tex]m=\frac{k}{d}[/tex]

Solution:

[tex]m=\frac{k}{d}\\12=\frac{60}{d}\\12d=60\\\frac{12d}{12}=\frac{60}{12}\\\boxed{\boldsymbol{d=5}}[/tex]

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