Question

Kim has $4.75 in nickels and dimes. If she has twice as many dimes as nickels, how many of each coin does she have?

Answer 1

0.05n + 0.1d = 4.75 
d = 2n 
0.05n + 0.1(2n) = 4.75 
0.25n *100 = 4.75 8100 
25n = 475 
25n/25 = 475/25 
n = 19 
d = 2n 
d = 2(19) 
d = 38 

dimes = 38 
nickels =19