Party trick To guess your partner’s age and height, have him/her do the following:
1 Write down his/her age.
2 Multiply it by 2.
3 Add 5.
4 Multiply this sum by 50.
5 Subtract 365.
6 Add his/her height (in inches).
7 Add 115.
The first two digits of the result equal his/her age, and the last two digits equal his/her height. Explain why this is true.
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