Since $1.15 ends with a 5, the bank cannot contain exactly 2 quarters or exactly 4 quarters, because adding any number of dimes to 2 or 4 quarters will only give a sum ending in 0. So there can only either be exactly 1 or exactly 3 quarters. So there are just 2 possibilities: If there is exactly 1 quarter, the remaining 90˘ must consist of 9 dimes. If there are exactly 3 quarters, the remaining 40˘ must consist of 4 dimes. Edwin