Question 1157918

you dump out your piggy bank and find that you have only nickels and dimes. there are a total of 50 coins and the coins add up to 3.90 how many nickles [sic] do you have ?
<pre>Let number of nickels be N
Then number of dimes = 50 - N
We then get: .05N + .1(50 - N) = 3.9
.05N + 5 - .1N = 3.9
.05N - .1N = 3.9 - 5
- .05N = - 1.1
Number of nickels, or {{{highlight_green(matrix(1,5, N, "=", (- 1.1)/(- .05), "=", 22))}}}