leon has nickels and dimes. the total number is 21. the total value is $1.75 how many nickels and dimes are there?

Question

what is the system of the equation? Show work

Answer 1

n = number of nickels at 0.05 each

d = number of dimes at 0.10 each

 

n + d = 21

0.05n + 0.10d = 1.75

 

Solve for n and d using substitution, matrix methods, elimination, or Cramer's rule.  Can you finish from here?