let the first two numbers written down be
x and y
the numbers would appear this way
21x+34y , notice the "Fibonacci Number" pattern
total = 55x + 88y
= 11(5x + 8y)
The magician should be reasonably capable of doing some quick mental arithmetic
.... multiply the first number by 5 and the 2nd by 8, add those up, and multiply the result by 11
suppose the first 2 numbers written down are
4 and 7
5 times 4= 20, and 8 times 7 = 56
20+56 = 76
multiplying a two digit number by 11 is easy ...
11x76 = 836
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