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Riddles, one at a time

Which number is the BIGGEST?

Video · Easy Challenge link
Answer

CX

XC = 90, LX = 60, CX = 110, XL = 40. CX wins.

The Brass Grilles

Read the holes row by row. Which grille shows a real word, and what is it?

Picture · Hard Challenge link
Answer

B: MAPLE

Read the holes row by row, left to right.

A straight 15 m fence has a post every 3 m, with one at each end. How many posts are there?

Video · Easy Challenge link
Answer

6

15 ÷ 3 = 5 gaps, and 5 gaps need 6 posts.

Full explanation on the blog

Which tokens pay 24 with the fewest tokens?

Video · Genius Challenge link
Answer

6 + 6 + 6 + 6

Just 4 tokens. Biggest first, 15 + 6 + 1 + 1 + 1, needs 5.

Valves stay as shown. Which jar fills with water?

Video · Medium Challenge link
Answer

JAR C

Every other route ends at a closed valve.

Which shadow appears on the wall?

Video · Medium Challenge link
Answer

C

Each row's tallest stack sets the shadow.

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