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Anonymous
517 - without using a calculator !
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47 x 1 47 x 11 47 x 21 etc.
6x + 47 = 9x + 11 6x + 36 = 9x 36 = 3x 12 = x
4x + 3 = 47 4x = 47-3 4x = 44 x = 44/4 x = 11
11 with 3 remaining 47 - 3 = 44 = 11 x 4
11 x 47, or 517 x 1