The greatest four digits number which is divisible by 15, 25, 40 and 75 is:
The 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.
So, required number (9999 - 399) = 9600