21 miles equal how many feet

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers

Atorch and a battery cost 2.50 altogether.the torch costs 1.50 more than the battery.what fraction of the total price is the torch? give your answer in its simplest form.

If you have 12 feet of string and you cut it into equal length of 5 inches each how much string will be left