Page:Mathematical Recreations or, a Collection of many Problems Extracted out of the Ancient and Modern Philosophers (Jean Leurechon, 1674, b30325882).pdf/47

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Mathematical

RECREATION.

PROBLEM I.

To find a Number thought upon.

BId him that he Quadruple the Number throught upon, that is, multiply it by 4, and unto it bid him to add 6, 8, 10, or any Number at pleaſure: and let him take the half of the ſum, then ask how much it cocmes to? for then if you take away half the number from it which you willed him at firſt to add to it, there ſhall remain the double of the number thought upon.

B

Example.