Kevin and randy muise have a jar containing 63 coins, all of which are either quarters or nickels. the total value of the coins in the jar is $ 8.35. how many of each type of coin do they have?

90.0% complete a b c d e confirm last week, your delivery runs took 7 hours 12 minutes on monday, 6 hours 46 minutes on wednesday, and 6 hours 53 minutes on friday. what was your average time for a delivery run?