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(399+601):k=625:25 equation

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Numerical solution:

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The solution

You have entered [src]
1000     
---- = 25
 k       
$$\frac{1000}{k} = 25$$
Detail solution
Given the equation:
$$\frac{1000}{k} = 25$$
Use proportions rule:
From a1/b1 = a2/b2 should a1*b2 = a2*b1,
In this case
a1 = 1

b1 = -1/25

a2 = 1

b2 = -k/1000

so we get the equation
$$- \frac{k}{1000} = - \frac{1}{25}$$
$$- \frac{k}{1000} = - \frac{1}{25}$$
Divide both parts of the equation by -1/1000
k = -1/25 / (-1/1000)

We get the answer: k = 40
The graph
Sum and product of roots [src]
sum
40
$$40$$
=
40
$$40$$
product
40
$$40$$
=
40
$$40$$
40
Rapid solution [src]
k1 = 40
$$k_{1} = 40$$
k1 = 40
Numerical answer [src]
k1 = 40.0
k1 = 40.0