You can
put this solution on YOUR website!you must set up a system of equations and begin by naming the trails ie.
x = length of trail 1
y = length of trail 2
z = length of trail 3
the lengths of all three trails equal 20km so x + y + z = 20
the first trail is 1km shorter than twice the second so x = 2y - 1
the third trail is 2km longer than the first so z = x + 2, however since the first trail is solved using the second trail we can substitute the value of x into this equation giving you z = 2y - 1 + 2
Here's the system of equations
x + y + z = 20
x = 2y - 1
z = 2y + 1
Substitute the x and the z into the first equation and solve for y
2y - 1 + y + 2y + 1 = 20
5y = 20
y = 4, so the length of the second trail is 4km
Given that solve for the other two lengths
x = 2(4) -1
x = 7, so the first trail is 7km
z = 2(4) + 1
Z = 9, so the third trail is 9km
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