Think of a Number... ... ... .Tell him to write down his age.
Double it.
Add 5.
Multiply the total by 100.
Divide the total by 2.
From the total he must deduct the number of days in a year (365 days)
To the resulting total he then adds the number he first thought.
At this stage your firiend must tell you his total and you add 115.
The two figures on the left of your total give his age (one figure if he is under ten) and the two figures on the right of your total give the number he first thought of !!
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