Question 1072511
n = number of nickels
q = number of quarters


n + q = 36
5n + 25q = 620


Multiply the first equation by 25. We are going to eliminate the variable q.


25n + 25q = 900
5n + 25q = 620


Subtract: 20n = 280, so n = 14.


There are 14 nickels in the jar.