The greatest number of four digits which is divisible by 10, 13, 40 and 60 is:  Choose one.
A) 9200	B) 9300	C) 9400	D) 7800	E) 8700
Greatest number of 4-digits is 9999.   L.C.M. of 10, 13, 40 and 60 is 600.   On dividing 9999 by 7800, the remainder is 2199.   Required number  (9999 - 2199)= 
<gadget id="calculator"> (9999 - 2199)</gadget>
<output>7_800</output>
7800.   ANSWER :7800
<result>D</result>
The greatest number of four digits which is divisible by 10, 13, 40 and 60 is: