tìm số có ba chữ số sao cho tổng của nó với 126 chia hết cho 504
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Gọi số đó là A
A+126 chia hết 504
A là số có 3 chữ số => 99<A<1000 => 225<A+126<1126
Trong khoảng từ 225 đến 1126 chỉ có 504 và 1008 chia hết 504 => A+126 bằng 504 hoặc 1008 => A=378;882