The value of a 1950 Jefferson nickel is 8/5 the value of the 1945 nickel. Together the value of the two coins is $91. What is the value of each coin?
let '45 nickel have value of $x
then '50 nickel has value of 8x/5
solve x + 8x/5 = 91
5x + 8x = 455
you finish it ...