Probleam based on HCF & LCM

Que1. The greatest number of four digits which is divisible by 15, 25, 40 and 75 is:
A.     9000                B.     9400
C.     9600                 D.     9800

 Ans: C
                Greatest number of 4-digits is 9999.
                 L.C.M. of 15, 25, 40 and 75 is 600.
                On dividing 9999 by 600, the remainder is 399.
               Required number (9999 - 399) = 9600.

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