Riddles, one at a time
Robot Program: Zigzag
Straight arrow: 1 tile forward. Curved arrow: turn on the spot, to its own left or right. Which tile does it stop on?
Turns use the robot's own left and right, and a turn does not move it.
D
Up 2, left 1, up 1, then right 2: tile D.
One Stroke: Tall
Without lifting your pen and without going over any line twice, which figure can you draw?
Count the lines at each dot. Odd dots must be the start or the end.
C
C has only 2 odd dots. A has 6; B and D have 4.
The Lake Word
Only one word looks the same in the lake. Which one?
Which letters look the same when flipped top to bottom?
CHOICE
Every letter of CHOICE is the same top and bottom, so the water cannot change it.
100 Days Later
Monday
100 = 14 weeks (98 days) + 2 days. Saturday + 2 = Monday.
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.
Two Candles: Twice as Tall
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?
A loses a quarter of its height each hour, B loses a sixth.
3 hours
After 3 h, A has 1/4 left and B has 1/2 left: twice.