Sean is taking some friends on a picnic. They'll need to follow a path to get to the picnic spot. A map of the path is based on a scale of 1:30,000, in cm.
- If the path is 20cm on the map, how many kilometers is the actual path

Question

Sean is taking some friends on a picnic. They'll need to follow a path to get to the picnic spot. A map of the path is based on a scale of 1:30,000, in cm.
- If the path is 20cm on the map, how many kilometers is the actual path

lapinblanc · Answer

Ratio solutions follow:
a/b=c/d
you have 
1/30,000=20/x
solve for x
Convert to km by multiplying by 1x10^-5

lapinblanc · Answer

1/30000=20/x
multiply by reciprocal 
30,000(1/30,000)=(20/x)30,000
1=600,000/x
x*1=(600,000/x)x
x=600,000cm
Km conversion to cm is 1km=1x10^-5
1x10^-5 is the same as 0.00001
So
600,000 x 0.0001=6km

lapinblanc · Answer

I'm sorry, to be clear, conversion was 1cm=1x10^5km.
Everything else is accurate.