Math brain teaser

  • Thread starter amathea
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  • #1
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Sorry if I am posting in the wrong forum.Please be gentle since it is my first post

Found it in a magazine...and as much as I've tried - I cannot solve how it is done. I am sure someone can be of help.

1.First of all, pick the number of times a week that you would like to eat chocolate (try for more than once but less than 10).

2. Multiply this number by 2 (just to be bold).

3. Add 5 (for Sunday).

4. Multiply it by 50 (I'll wait while you get the calculator).

5. If you have already had your birthday this year add 1753, if not, add 1752.

6. Now subtract the four digit year that you were born.

You should have a three digit number. The first digit of this was your original number (how many times you want to eat chocolate each week). The next two numbers are.. YOUR AGE!

Thank you and enjoy :)

Ama
 

Answers and Replies

  • #2
1.First of all, pick the number of times a week that you would like to eat chocolate (try for more than once but less than 10).
Let n be the number you pick, where 10> n >= 1

2. Multiply this number by 2 (just to be bold).

3. Add 5 (for Sunday).

4. Multiply it by 50 (I'll wait while you get the calculator).
100n + 250

5. If you have already had your birthday this year add 1753, if not, add 1752.
If you haven't had your birthday this year, you'll get 100n + 2002
If you have had your birthday this year, you'll get 100n + 2003

6. Now subtract the four digit year that you were born.
After sutracting the year when you were born, your age, which is a 2 digit number, will appear in the last 2 digits.
100n explains why the first digit was the original number you picked.
 

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