A merchant can place 8 large boxes or 10 small boxes into a carton for shipping. In one shipment, he sent a total of 96 boxes. If there are more large boxes than small boxes, how many cartons did he ship?
You can try guessing and checking by first placing all the large boxes, then slowly decreasing the number.
But we can't say 12 large boxes and 0 small boxes, because there has to be an amount for the small boxes.
Hint: To find the number of small boxes, it has to be a multiple of 10. So, what number must 8 be multiplied, that when the number is subtracted from 96, it is divisible by 10?