Riddles, one at a time
Fewest Tokens: Pay 18
Which tokens pay 18 with the fewest tokens?
Biggest first is not always fewest. Try every pair.
9 + 9
Just 2 tokens. Biggest first, 16 + 1 + 1, needs 3.
What Am I? Ribs but No Bones
Umbrella
It opens in the rain, closes after, and has ribs: C.
Twelve Glowing Dots
How many squares can you make by joining 4 dots?
Don't forget squares standing on a corner.
11
5 upright squares and 6 tilted ones.
Move One Rod
Move exactly one rod. What is the true equation?
9 − 8 = 1
The top rod of the 7 turns the 3 into a 9.
Hands Apart: 9:45
What is the SMALLER angle between the hands?
The hour hand moves 30° each hour. How far has it gone after 45 minutes?
22.5°
The minute hand is on 9; the hour hand is 3/4 of the way to 10: 3/4 × 30° = 22.5°.
Two Candles: 32 cm and 22 cm
After how many hours are they the same height?
Find the gap at the start, then how much it closes each hour.
5 hours
After 5 h: A is 32 − 20 = 12 cm, B is 22 − 10 = 12 cm.