Riddles, one at a time
Hands Apart: 2:20
What is the SMALLER angle between the hands?
In 20 minutes the hour hand moves 10° past the 2.
50°
Minute hand at 120°, hour hand at 60° + 10° = 70°: 50° apart.
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?
Do not wait for one flatbread to finish before starting the third.
3 minutes
Minute 1: A and B. Minute 2: A's other side and C. Minute 3: the other sides of B and C.
Flip, Then Turn
B
Flip left-right first, then a quarter turn clockwise: card B.
How Many Routes: 3 × 2 Grid
Moving only right or up, how many different routes lead from start to the gem?
Each corner's count is the count to its left plus the count below it.
10
The two corners next to the gem can be reached in 6 and 4 ways: 6 + 4 = 10.
Two Candles: 12 cm and 8 cm
After how many hours are they the same height?
Find the gap between the candles, then how much it shrinks each hour.
4 hours
After 4 h: A is 12 − 8 = 4 cm, B is 8 − 4 = 4 cm.
How Many Triangles?
How many triangles are in the figure?
15
Single pieces plus every combined shape: 15 in all.