Find the greatest number which leaves the same remainder when it divides 20, 40 and 90.
Choices
A) 18	B) 8	C) 12	D) 10	E) None of these
90 - 40= 
<gadget id="calculator">90 - 40</gadget>
<output>50</output>
50   40 - 20= 
<gadget id="calculator">40 - 20</gadget>
<output>20</output>
20   90 - 20= 
<gadget id="calculator">90 - 20</gadget>
<output>70</output>
70   The H.C.F of 20, 50 and 70 is 10.   ANSWER:10
<result>D</result>
Find the greatest number which leaves the same remainder when it divides 20, 40 and 90.