Question 1003012
n = number of nickels
d = number of dimes


n + d = 28
5n + 10d = 260


Multiply the first equation by 10. We are going to eliminate the variable d.


10n + 10d = 280
5n + 10d = 260


Subtracting, we get 5n = 20, so n = 4.


Mashu has 4 nickels and 24 dimes.