Mathematics, 15.04.2020 03:24 JamierW2005

Suppose that the amount of time it takes to build a highway varies directly with the length of the highway and inversely with the number of workers. Suppose also that it takes 150 workers 14 weeks to build 12 miles of highway. How long will it take 125 workers to build 15 miles of highway?

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Answer from: Echo009

The time required by 125 workers to build 15 miles of highway is 21 weeks and this can be determined by forming an mathematical expression with the help of the given data.

Given :

The amount of time it takes to build a highway varies directly with the length of the highway and inversely with the number of workers.Suppose that it takes 150 workers 14 weeks to build 12 miles of highway.

According to the given data the amount of time it takes to build a highway varies directly with the length of the highway and inversely with the number of workers that is:

$\rm t \;\alpha \;\dfrac{L}{N}$

where t is the time taken to build the highway, L is the length of the highway and N is the number of workers.

So, the mathematical expression of the above relationship is:

$\rm t = k\times \dfrac{L}{N}$ ---- (1)

where k is the proportionality constant.

Now, substitute the known terms in order to determine the value of K.

$\rm 14=K\dfrac{12}{150}$

Cross multiply in the above expression.

$\rm 150\times 14 = K \times 12$

2100 = 12K

175 = K

Now, substitute the values of K that is 175, N that is 125, and L that is 15 in the equation (1).

$\rm t = \dfrac{175\times 15}{125}$

Simplify the above expression in order to get the value of 't'.

$\rm t = \dfrac{2625}{125}$

t = 21 weeks

So, the time required by 125 workers to build 15 miles of highway is 21 weeks.

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Answer from: Geo777

21 weeks

Step-by-step explanation:

In this question, we are to use proportionality to find the solution to the question.

We were made to know that the time taken to build the highway is varied directly with the length and inversely with the number of workers.

Let us make a mathematical representation for this.

Let the time be t, number of workers be w and length be l

t is directly proportional to l and inversely proportional to w

Mathematically;

t = kl/w

Where k is the constant of proportionality.

Let’s find the value of k

150 workers built 12 miles of highway in 14 weeks ; plug these in the equation to get k

14 = k * 12/150

k = 150 * 14/12 = 175

Now we want to get t given w and l

from ;

t = kl/w

We can get t; where l = 15 and w = 125

t = 175 * 15/125

t = 21 weeks

Answer from: Quest

Dis a correct answer

Answer from: Quest

answer set (b) 0.5, 3/4 80% is in order from least to greatest.

step-by-step explanation:

in order to compare rational numbers to each other, it is much easier if they are in the same form. typically, the best form in which to evaluate rational numbers is in decimals. in order to convert a percent to a decimal, you would divide the given percentage by 100. you can also accomplish the conversion by moving the decimal point over two places to the left. for example, the decimal value of 80% is 80/100, or 0.8. in order to convert a fraction to a decimal, you need to divide the numerator by the denominator. for example, 3/4 is 0.75. so, for choice (b) 0.5 3/4 (0.75), 80% (0.8) is the only choice in which the numbers are in order from least to greatest.