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Mathematics
14.01.2020 21:11
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What is the perimeter of the polygon shown? a. 16 units b. 14 units c. 20 units

What is the perimeter of the polygon shown? a. 16 units b. 14 units c. 20 units d. 12 unit
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lays20001
lays20001
4,4(80 marks)

9 hours

Step-by-step explanation:

12 people take 15 hours to complete one job. First let's ask how long it would take 18 people working at the same rate to complete the same job? We can use proportions to answer this

\frac{12 people}{15 hours} = \frac{18 people}{x hours}\\x = \frac{18\times15}{12} = 22.5

Now we know that one job takes 18 people 22.5 hours, so 2/5 of the job would take

\frac{18\times15}{12} \times \frac{2}{5} = 9

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