Mind Teasers

Challenge 2
A game to find out a person's age and how many coins they are carrying.
    • Ask someone to double their age (either mentally or on paper) but, obviously, they must not tell you.
    • Then to add 5 and multiply by 50.
    • Finally, they must add the number of coins they have on them.   If they do not have any, nothing is added.
    • They then tell you the final answer.
    • Now all you have to do is take away 250.  The first two digits of the answer you are left with are the persons age and the last two the number of coins in their possession.
This works unless they are carrying over 100 loose coins.
Example -   25 x 2 = 50 + 5 = 55 x 50 = 2750 + 6 = 2756
                     2756 - 250 = 2506
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Challenge 3
Take any three digit number in which the first and last number differ by more than one i.e. 335 would be O.K. but not 333, or 332.
Reverse this number
Subtract the smaller number from the larger.
Add this answer to the same number reversed and the answer is ALWAYS 1089.
Example 1:-
335    Reversed = 533
533 - 335 = 198
198 + 891(198 reversed) = 1089
Example 2:
932 reversed = 239
932 - 239 = 693
693 +396 = 1089
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Challenge 4
Get a friend to throw a dice three times and you will be able to tell them which numbers came up and in which order.
This is what they have to do -
    • Throw dice
    • Multiply number by 2
    • Add 5
    • Multiply by 5 (Remember this total)
    • Throw dice second time
    • Add this second number to the previous total.
    • Multiply by 10 (Remember total)
    • Throw the dice for the third time and add the number to the last total.
Ask for the final total.  Subtract 250 and you will be left with three figures.  These figures represent the numbers thrown and the in which they appeared.
Example:
First throw = 4
4 x 2 = 8
8 + 5 = 13
13 x 5 = 65
Second throw = 2
65 + 2 = 67
67 x 10 = 670
Third throw = 6
670 + 6 = 676
676 - 250 = 426 = 4 2 6





Mystery...