Changing color balls puzzle
Kevin, Charles, Larry and Alex are in a room that’s about 110 feet long. In front of them are 5 balls which are exactly 100 ft from the exit. The balls are yellow, purple, green, red and blue, respectively. Each man must carry a ball to the exit. After traveling 20 ft a ball will change color twice. The sequence of color changes is always the same: yellow, purple, green, red, and blue.
At 80 ft Kevin’s ball is red.
At 40 ft Larry’s ball is purple.
At 60 ft Charles’ ball is blue
At 100 ft Alex’s ball is purple.
What color ball was left behind?
Answer – The Ball left was blue.
The table of each ball and the color where it changes to at 20, 40, 60, 80 and 100 ft.
Kevin’s started out yellow,
Larry’s with green,
Charles’ with red and
Alex began with a purple ball,
So, blue call was left unpicked.
| 20 ft | 40 ft | 60 ft | 80 ft | 100 ft | |
|---|---|---|---|---|---|
| Yellow |
Green |
Blue |
Purple |
Red |
Yellow |
| Purple |
Red |
Yellow |
Green |
Blue |
Purple |
| Green |
Blue |
Purple |
Red |
Yellow |
Green |
| Red |
Yellow |
Green |
Blue |
Purple |
Red |
| Blue |
Purple |
Red |
Yellow |
Green |
Blue |
LARRY-GREEN,
CHARLES-RED,
KEVIN-YELLOW,
ALEX-PURPLE,
ANSWER-BLUE
Assuming that the colour “At” X feet is the colour AFTER the colour-change at that stage:
At 80 ft Kevin’s ball is red => the ball was purple at 60 ft; blue at 40 ft; green at 20 ft. => The ball was YELLOW at the beginning.
At 40 ft Larry’s ball is purple: Following the same line as above, it should have been GREEN in the beginning.
At 60 ft Charles’ ball is blue => The ball was originally BLUE itself.
At 100 ft Alex’s ball is purple => The original colour was PURPLE.
So, the ball left-behind must have been RED.
…….
Re-written after reading the puzzle again.
Still not correct
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