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Riddles, one at a time

How long to cut the log into 5 pieces?

Video · Easy Challenge link
Answer

8 minutes

5 pieces need only 4 cuts: 4 × 2 = 8 minutes.

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.

What is LIV − XLIV, in Roman numerals?

Video · Medium Challenge link
Answer

X

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

Which tile belongs in the very centre?

Video · Medium Challenge link
Answer

D

Only D is round, blue AND has a dot.

Two candles of the same height are lit together and burn at a steady rate. A lasts 4 hours, B lasts 6 hours. After how many hours is B twice as tall as A?

Video · Genius Challenge link
Answer

3 hours

After 3 h, A has 1/4 left and B has 1/2 left: twice.

What day is today?

Video · Easy Challenge link
Answer

Wednesday

Two days back from Friday: Thursday, then Wednesday.

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