You should say "What is the common factor of 231 and 165?" or "What number is divisible by both 231 and 165?"
In that case, the answer is 11.
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The highest common factor is 33
231 can only go into 28 as a fraction (28/231 which simplifies to 4/33).
33, 66, 99, 132, 165, 198, 231, 264, 297, 330, 363, . . .
231 ÷ 7 = 33
231