Riddles, one at a time
Two Glass Cards
Slide the two glass cards together. Which number appears?
Imagine the strokes of both cards on one card.
Video · Easy
Challenge link
Answer
48
Card A's strokes fill the gaps on card B: 4 and 8.
Hands Apart: 9:45
What is the SMALLER angle between the hands?
The hour hand moves 30° each hour. How far has it gone after 45 minutes?
Video · Genius
Challenge link
Answer
22.5°
The minute hand is on 9; the hour hand is 3/4 of the way to 10: 3/4 × 30° = 22.5°.
Roman Subtraction
What is LIV − XLIV, in Roman numerals?
Turn both into ordinary numbers first.
Video · Medium
Challenge link
Answer
X
LIV = 54 and XLIV = 44. 54 − 44 = 10, which is X.
How Many Routes: 2 × 2 Grid
Moving only right or up, how many different routes lead from start to the gem?
Each corner's count is the count to its left plus the count below it.
Video · Medium
Challenge link
Answer
6
Add the ways from the left and from below: 3 + 3 = 6.
Which Ring? Even and Big
Which number belongs in the middle?
It must be even and more than 50.
Video · Easy
Challenge link
Answer
D
64 is even AND more than 50. 38 is too small; 47 and 75 are odd.
Glass Overlay: Shared Lines
Which card completes the grid?
Keep only the lines that appear on both of the first two cards.
Video · Hard
Challenge link
Answer
A
In each row, only lines on both cards stay. Row 3 gives card A.
Challenge link
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