Car odometer (ACT)

The odometer of a new automobile functions improperly and registers only  2 miles for every 3 miles driven. If the odometer indicates 48 miles, how many miles has the automobile actually been driven?
A.)  144
B.)  72
C.)  64
D.)  32
E.)  24 

Set up a proportion:

2 registered         48 registered      
----------------   =   -----------------
   3 actual               x actual

2x = 144 {cross-multiplied}
x = 72 {divided both sides by 2}

B.)  72

- Algebra House