Question

Find the greatest 4-digit number which is exactly divisible by 45,75 and 81

Answer 1

Answer: 8,100

LCM of 45, 75 and 81 is 2,025. Greatest 4 digit number is 9,999.

Now dividing 9,999 by 2,025 we get remainder as 1,899. So the 4-digit number exactly divisible by 45,75 & 81  = 9,999 -1,899 = 8,100