Coin denominations in the US
Coin denominations in the Philippines as of 2012
Bohol.ph has more information about Philippine coins. See http://www.bohol.ph/article34.html
A collection of 32 coins amounted to \$5.15. If it consists of dimes and quarters, how many quarters are there?
$0.25x + 0.10(32 - x) = 5.15$
$0.15x = 1.95$
$x = 13$ → no. of 25 ¢ coins answer