Where each of the numbers is less than 10. Suppose the numbers thought
of were 2, 3, 5.
EXAMPLE.
1. Desire him to double the first number, making 4
2. To add one to it 5
3. To multiply by 5 25
4. To add the second number 28
There being a third number, repeat the process.
5. To double it 56
6. To add 1 to it 57
7. To multiply by 5 285
8. To add the third number 290
And to proceed in the same manner for as many numbers as were thought
of. Let him tell you the last sum produced (in this case, 290). Then,
if there were two numbers thought of, you must subtract 5; if three,
55; if four, 555. You must here subtract 55; leaving a remainder of
235, which are the numbers thought of, 2, 3, and 5.