Mr. waterman has $5, $10, and $25 gift certificates to
a local ice cream parlor. he would like to give each of
his nephews and nieces $55 worth of gift cerificates to
the ice cream parlor. if he wants to make sure that each
nephew and niece receives at least one of each type of gift
certificate, what is the difference between the maximum
number of $5 gift certificates and minimum number of $5
gift certificates that each child could receive?