1786
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119
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There are 28 possible battery pairs (8×7/2).
Only 6 of them have two working batteries (4×3/2)
Worst case the first 22 pairs tried contain at least one wrong battery.
So attempt 23 will succeed.- 2590 views
- 2 answers
- 0 votes
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If the traveller is really kind he will make himself the starting point and kill the king with the sword and let all the others live.
When following the rules he also should make himself the starting point.
The total number of people should be a power of 2 and the lowest power of 2 greater than 489 would be 512.
Although his position is 489, when he starts the game his actual position is 1.
When the sword did a full round all the even numbers would be killed.
After renumbering all positions in the next round also all even numbers will be killed.
In the end only person number 1 will be left (when the total number of persons is a power of 2).- 1717 views
- 1 answers
- 0 votes
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- 2767 views
- 1 answers
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5
They both start with X jelly beans.
If the boy give 5 beans to the girl he will have X-5 beans and she X+5
(X+5)-(X-5) = 10- 1697 views
- 2 answers
- 0 votes
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No, when you spin there is a 2 out of 6 chance you will get a bullet.
There are 4 empty cylinders and for only one the next cylinder will contain a bullet.
So without spinning you have a 1 out 4 change to get a bullet.- 3572 views
- 2 answers
- 1 votes
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Suppose we have the colors 1 thru 6.
Each color is on exactly one face.To determine the number of possibilities we rotate the cube so that color 1 is on the bottom face.
The top face can be any of the remaining 5 colors.
We know rotate the cube so that color 2 is on the left face (and color 1 still at the bottom).
If color 2 is at the top face we rotate so that color 3 is the left face.
Rotating this way doesn’t change the number of possibilities.For the front, right and back face we have 3 colors left. And there are 6 ways they can be arranged (3x2x1).
The total number of unique ways to paint the cube is 30 (5×6).
This answer accepted by SherlockHolmes. on 25th October 2019 Earned 20 points.
- 3933 views
- 2 answers
- 0 votes
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The age difference is 31 – 8 = 23.
So the son is 23 and the father is 46 (2*23)- 2405 views
- 2 answers
- 0 votes
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Scooter B is the only one that can reach the pump when entering the maze at the starting point.
But there is an other way to reach the pump by entering the maze at the opening between scooter B an D.
Using that entry scooter B and D will reach the pump at the same time.This answer accepted by SherlockHolmes. on 22nd October 2019 Earned 20 points.
- 6355 views
- 1 answers
- 0 votes
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Cal’s hat is blue.
If Abe sees two red hats he would know his hat is blue.
So he sees at least one blue hat. The other one can either be red or blue.
If Bill sees a red hat he knows he must have a blue hat.
But Bill doesn’t know what hat he haves so he must be seeing a blue hat.This answer accepted by SherlockHolmes. on 22nd October 2019 Earned 20 points.
- 5147 views
- 2 answers
- 0 votes
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Glass number 3
The pipe to number 3 is lower than the pipe to number 2
And the pipes to 6 and 7 are closed.
Also glass 3 will be the only one that is filled completely.
And glass 1 will be filled partially.
The rest will stay empty.This answer accepted by SherlockHolmes. on 14th October 2019 Earned 20 points.
- 5030 views
- 1 answers
- 0 votes