How many quarts of pure antifreeze must be added to 7 quarts of a 10% antifreeze solution to obtain a 60% antifreeze solution?
quart(s) of pure antifreeze must be added.
(round to the nearest tenth as needed.)

You are saving to buy a bicycle; so far you save 55.00. the bicycle costs 199.00. you earn 9.00 per hour at your job. which inequality represents the possible number of h hours you need to work to buy the bicycle?