As the manager of an auto repair shop, you decide to compile some statistics on the cars you service. last week your shop serviced 72 cars. on 12 of these cars you replaced the muffler. express this as a percent of cars serviced that needed mufflers.

17 %

Step-by-step explanation:

12 of 72 cars needed mufflers

% = cars needing mufflers/total cars × 100 %

  = 12/72 × 100 %

  = 17 %

17 % of the cars serviced needed muflers.

picture below

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles