Riddles, one at a time
Mirror Odometer: 15951
How many more km until the next mirror number?
The middle digit is already 9, so it cannot go up. What has to change instead?
110 km
The next mirror number is 16061: 16061 − 15951 = 110.
What Am I? Teeth but No Bite
Which object fits all three clues?
A comb and a saw have teeth too. Check clues 2 and 3.
Key
It has teeth that never bite, opens what is shut and lives on a key ring: D.
Fewest Tokens: Pay 11
Which tokens pay 11 with the fewest tokens?
Biggest first is not always fewest. Try every pair.
5 + 6
Just 2 tokens. Biggest first, 9 + 1 + 1, needs 3.
Three Glass Panes
Which colour hides under the ? card?
B RED
Magenta stops green, yellow stops blue: red is left.
Fence Posts
A straight 15 m fence has a post every 3 m, with one at each end. How many posts are there?
Count the gaps first, then the posts.
6
15 ÷ 3 = 5 gaps, and 5 gaps need 6 posts.
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.