This only takes about 30 seconds. Work this out as you read.

DON'T CHEAT BY SCROLLING DOWN FIRST! :Þ

Pick the number of days a week that you would like to eat out.

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Multiply this number by 2.

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Add 5.

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Multiply it by 50.

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If you have already had your birthday this year add 1749.
If you haven't, add 1748.

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Now subtract the four digit year that you were born.

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SEE BELOW

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You should now have a three digit number:

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The first digit of this was your original number
(i.e. how many times you want to go out each week).

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The second two digits are your age.

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This is the only year (1999) it will ever work, so spread the fun around while it lasts....