Question 1048748
Give the count of each coin its own variable.  Account for how many coins and account for how much money.  You will have two linear equations in two unknown variables.   SIMPLIFY the system and solve the system.


Here is only a part-way solution and is unfinished.


d, how many dimes
q, how many quarters


{{{system(d+q=80,0.1d+0.25q=12.05)}}}


You might be tempted to try substitution, but you really should be sure to simplify the money count equation so that the coefficients are WHOLE numbers, and then try to use Elimination Method to solve the system  (or you could still choose Substitution method).