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3 years ago

200 labourers need 50 days to construct a road of 4 km long. How many labourers are needed to construct 8 km long in 80 days

Mathematics

1 answer:

patriot [66]3 years ago

7 0

Answer:

250

Step-by-step explanation:

Number of labourers * Number of days worked = Total number of working days

Total number of working days to construct a 4km long road: $200*50=10000$

Total mumber of working days to construct a 8km long road: $10000*2=20000$

Labourers: 20000 ÷ 80 = 250.

250 labourers are required.

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zloy xaker [14]

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$x=-\dfrac{44}{7}$

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Step-by-step explanation:

Arrange the equations so that all the variables are in columns (x as the first column, y as the second, equals a number as the third):

-11x - 4y = 36

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Define and edit Matrix A. We need a 3 x 2 matrix. Input the coefficients and constant:

$\left[\begin{array}{ccc}-11&-4&36\\5&5&-10\end{array}\right]$

Find rref function, enter matrix A: rref([A]) (press enter)

This gives you:

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2 years ago

200 labourers need 50 days to construct a road of 4 km long. How many labourers are needed to construct 8 km long in 80 days​

200 labourers need 50 days to construct a road of 4 km long. How many labourers are needed to construct 8 km long in 80 days