21. A jar containing only nickels and dimes contains a total of 60 coins. The value of all the coins in the jar is $4.45. Which system of equations correctly represents this situation? a) n+d = 60 .05n + .10d = 4.45 b) n+d = 60 5n + 10d = 4.45 c) 5n + 10d = 60 n+d = 4.45 d) n+ 60 = d .05n - .10d = 4.45 22. Using the equations from #21, find the amount of nickels and dimes that are in the jar. Show your work. a. 30 nickels and 28 dimes b. 31 nickels and 29 dimes c. 29 nickels and 31 dimes d. 30 nickels and 32 dimes