Question

Find the greatest 4 number which is exactly divisible by 12,18,21 and 28​

Answer 1

The answer is 9999 divided by 144: 69 (with a fractional remainder that we will discard). That means that 144 will fit into 9999 no more than 69 times (and 70*144=10080 is greater than 9999). Therefore, the greatest 4-digit number exactly divisible by 12, 16, 24, 28, and 36 is the product 144*69.