Suppose 10 people could fix up 30 miles of trail, 35 people could fix 105 miles of trail.
How to solve proportion
To solve this problem, set up a proportion based on the number of people and the amount of trail they can fix.
Let's denote the number of miles of trail that 35 people can fix as "x".
Set up the proportion as follows:
10 people / 30 miles = 35 people / x miles
To solve for "x", cross-multiply and solve the resulting equation:
10 * x = 30 * 35
10x = 1050
Divide both sides by 10:
x = 105
Therefore, 35 people could fix 105 miles of trail.