Question

Shop only had 2 types of stamps left using

them you cannot pay a $.53 postage, but you
can pay a larger amount. What are the values
of the 2 stamps?

Answer 1

{3¢, 28¢} or {4¢, 19¢} or {7¢, 10¢}

Explanation:

54 = 1×54 = 2×27 = 3×18 = 6×9

Possible values of the stamps are 1 more than the values of a pair of factors. Of course, a 2¢ and 55¢ stamp will not permit paying 54¢ in postage, so that combination won't work. However, other pairs that will work are ...

• 3¢ and 28¢
• 4¢ and 19¢
• 7¢ and 10¢