Question 900418
There are four more dimes than {{{  highlight_green(x) }}} nickels. 
CENTS makes Sense (10 CENTS in a dime, 5 CENTS in a Nickel)
10(x+4) + 5x = 205
  15x = 165
    x = 11, number of Nickels.  There are 15dimes
And...
150 + 55 = 205