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Out To Dinner Mathematics in 2008

 

 Pick the number of times a week that you would like to have dinner out.

Multiply by 2.

Add 5.

Multiply by 50.

If you have already had your birthday this year add 1758…If you haven’t, add 1757.

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

You should have a three-digit number.  Tell me your three-digit number.

I can tell you how many times per week you would like to have dinner out.

Solution:

(2x+5)*50 + 1758-1981 = 100x + 250 + 1758 – 1981 = three-digit number

For example, if x=3 and your birthday has passed and you were born in 1981, then three-digit number is 327.  Since 250 + 1758 = 2008, you know 2008-1981 is the person’s age and it is exactly the last two digits of the three digit number.  You can then divide 300 by 100 to get the number of times a week you would like to go out to dinner.