Page:Mathematical Recreations or, a Collection of many Problems Extracted out of the Ancient and Modern Philosophers (Jean Leurechon, 1674, b30325882).pdf/48

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Id him which thinketh double his Number, and unto that double add 4, and bid him multiply that ame product by 5, and unto that product bid him add 12, and multiply that lat number by 10 (which is done eaily by etting a Cypher at the end of the number) then as him the lat number or product, and from it ecretly ubtract 320; the remainder in the hundreth place is the number thought upon.

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