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Riddles, one at a time

How many circles balance the last scale?

Video · Medium Challenge link
Answer

5 CIRCLES

Square = 2 circles, triangle = 3 circles.

Full explanation on the blog

I am a 4-digit number. My first digit is twice my last. My second digit is my first and last added together. All my digits add up to 20, and I am odd. What number am I?

Text · Genius Challenge link
Answer

6923

Call the last digit x: the digits are 2x, 3x, 20 - 6x and x. x can only be 1, 2 or 3; 1 breaks the third digit and 2 makes it even, so x = 3: 6923.

Which number is the BIGGEST?

Video · Easy Challenge link
Answer

CX

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

Read the Clocks

What time does clock 4 show?

Picture · Medium Challenge link
Answer

7:55

Each clock is 1 hour 35 minutes later.

Which card do you get?

Video · Medium Challenge link
Answer

C

Clockwise, the left column becomes the top row. Card C.

The big gear turns clockwise. Which lantern goes UP?

Video · Hard Challenge link
Answer

LANTERN C

Each mesh and the crossed belt flip the spin.

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