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Riddles, one at a time

Each lamp is worth double the lamp on its right. Which number does the bottom row show?

Video · Medium Challenge link
Answer

11

The lamps are worth 8, 4, 2, 1. Lit: 8 + 2 + 1 = 11.

Valves stay as shown. Which jar fills with water?

Video · Medium Challenge link
Answer

JAR C

Every other route ends at a closed valve.

What fraction of the square is gold?

Video · Genius Challenge link
Answer

2/3

The dark part is 1 middle square + 4 halves = 3 of 9 squares, so gold is 6/9 = 2/3.

I grow in the field. Drop my first letter and I warm your home. Drop one more and it is what you do at every meal. What am I?

Text · Easy Challenge link
Answer

WHEAT

WHEAT loses its W to become HEAT, then its H to become EAT.

Full explanation on the blog

Which object fits all three clues?

Video · Easy Challenge link
Answer

Umbrella

It opens in the rain, closes after, and has ribs: C.

Which tank fills up FIRST?

Video · Hard Challenge link
Answer

E

The cap stops A. Water takes each lowest open pipe: B, then D, then E.

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