On the map shown above, Anne measures the distance from Geneva toSparks to be 2.5 inches and the distance from Sparks to Melville to be 4inches. Based on Anne's measurements, about how many miles is it fromGeneva to Sparks to Melville?

In this case, we'll have to carry out several steps to find the solution.
Step 01:
Data:
Geneva to Sparks
2.5 in
Sparks to Melville
4 inches
Scale
1 in = 15 miles
Distance = ?
Step 02:
Distance :
Scale:
1 in = 15 miles
Geneva to Sparks
2.5 in * ( 15 miles / 1 in) = 37.5 miles
Sparks to Melville
4 inches * (15 miles / 1 in) = 60 miles
Total distance = 37.5 miles + 60 miles = 97.5 miles
That is the full solution.