CPM Homework Help : CCA Problem 4-104

Thirty coins, all dimes and nickels, are worth $\$2.60$ . How many nickels are there?

Hint:

Write two equations. One for the total number of coins and one for what the amount of coins are worth.
$d=$ dimes, $n=$ nickels

Answer:

$22$ dimes and $8$ nickels.