#### Nguyễn Anh Thư

10/03/2017 at 20:28-
Faded 26/01/2018 at 12:29
We have the following formula: If a number n divided by a, surplus b then (n - b) is divisible by a.

Example: 14 divide 3 by 2, and 14 - 2 = 12 divide by 3

Return to the problem Call the number to find n.

We have n - 7 divisible by 11, 13, 17, which is divisible by 11 x 13 x 17 = 2431

Since 2431 is not the 4 digit number, we increase n - 7 by 9999 9999: 2431 = 4 by 275.

Let n - 7 = 2431 x 4 = 9724.

Vâỵn = 9724 + 7 = 9731 -
Nguyễn Việt Hoàng 10/03/2017 at 20:30
We have the following formula: If a number n divided by a, surplus b then (n - b) is divisible by a.

Example: 14 divide 3 by 2, and 14 - 2 = 12 divide by 3

Return to the problem Call the number to find n.

We have n - 7 divisible by 11, 13, 17, which is divisible by 11 x 13 x 17 = 2431

Since 2431 is not the 4 digit number, we increase n - 7 by 9999 9999: 2431 = 4 by 275.

Let n - 7 = 2431 x 4 = 9724.

Vâỵn = 9724 + 7 = 9731