81. This equilateral triangle is composed of six matchsticks. Can you rearrange the matchsticks to form eight equilateral triangles without breaking or bending any of them?
82. Based on the harbor diagram of Portus Augustī and the following information, match the name of each ship at anchor with its berth, the kind of vessel it is, and the name of the captain.
83. If the left-hand coin is rolled around the top of the right-hand coin, which way would the head be facing in its new position: left, right, up, or down?
84. Can you connect all the dots with just four straight lines without lifting your pencil from the paper or retracing any lines?
85. When Véronique returned from shopping in the macellum, she realized that a merchant had given her extra coins in her change as a donativum. Her purchases totaled two and a quarter sestertii, and she received ten asses in change from a denarius. At the time of her purchases, 1 gold aureus = 25 silver denarii = 100 brass sestertii = 400 bronze asses.
How much did she receive as a gratuity? What percentage of her purchase was it?
86. If each large ball weighs one and a third times the weight of each small ball, what is the minimum number of adjustments that will make the scales balance?
87. Prior to a meeting of the Senate, Gaius Perplexus challenged the assembly with this proposal: "I'll give an amphora of wine to the first citizen who can answer this question correctly."
pound of feathers or a pound of gold?
88. Start at the center of the grid and work your way to one of the corners by tracing the phrase "Io Saturnalia Io!" How many different pathways are there? What figure do you detect within the grid?
89. A curious puzzle from the East called sudoku has been brought to Rome. Each row and column should contain one of each of the Roman numerals I-VI. In addition, each of the shapes marked by thicker lines should also contain the Roman numerals I-VI. Are you able to solve this Roman sudoku?
90. Tignarius is an ingenious carpenter . He was able to cut this curved shape into three pieces that fit together to form a perfect square. Can you figure out his plan?