Riddles, one at a time

Which Ring? Even and Big

Which number belongs in the middle?

Video · Easy Challenge link
Answer

D

64 is even AND more than 50. 38 is too small; 47 and 75 are odd.

Flatbread Pan

A pan holds 2 flatbreads. Each side needs 1 minute. How few minutes can it take to cook 3 flatbreads on both sides?

Video · Hard Challenge link
Answer

3 minutes

Minute 1: A and B. Minute 2: A's other side and C. Minute 3: the other sides of B and C.

The Stone Garden

Which gate leads to the fountain?

Video · Easy Challenge link
Answer

GATE C

Every other gate is sealed off by a stone wall.

Roman Subtraction

What is LIV − XLIV, in Roman numerals?

Video · Medium Challenge link
Answer

X

LIV = 54 and XLIV = 44. 54 − 44 = 10, which is X.

The Lamp and the Wall

Which shadow appears on the wall?

Video · Medium Challenge link
Answer

C

Each row's tallest stack sets the shadow.

Lamp Code: Deduce the Lamps

What number does the last row show?

Video · Expert Challenge link
Answer

14

Lamps worth 8, 4, 2, 1 fit every row: 2 + 1 = 3, 4 + 1 = 5, 8 + 1 = 9, 4 + 2 = 6. So 8 + 4 + 2 = 14.

Challenge link