The greatest number of four digits which is divisible by 7, 10, 40 and 60 is:
Choices: A) 9200 B) 9300 C) 9400 D) 8400 E) 7400
Greatest number of 4-digits is 9999.   L.C.M. of 7, 10, 40 and 60 is 4200.   On dividing 9999 by 4200, the remainder is 1599.   Required number  (9999 - 1599)= 
<gadget id="calculator"> (9999 - 1599)</gadget>
<output>8_400</output>
8400.   ANSWER :8400
<result>D</result>
The greatest number of four digits which is divisible by 7, 10, 40 and 60 is: