Find the greatest number which leaves the same remainder when it divides 21, 57 and 105. Choose the correct answer
A) 18 B) 8 C) 12 D) 16 E) None of these
105 - 57= 
<gadget id="calculator">105 - 57</gadget>
<output>48</output>
48   57 - 21= 
<gadget id="calculator">57 - 21</gadget>
<output>36</output>
36   105 - 21= 
<gadget id="calculator">105 - 21</gadget>
<output>84</output>
84   The H.C.F of 36, 48 and 84 is 12.   ANSWER:12
<result>C</result>
Find the greatest number which leaves the same remainder when it divides 21, 57 and 105.