Explanation:
To have an equal number of buns and sausages, Arthur needs to find the least common multiple (LCM) of 6 and 10.
The LCM of 6 and 10 is 30.
Therefore, he should buy at least 30 packs of buns and 30 packs of sausages to get an equal number of buns and sausages.
That way, he would have 30/6 = 5 packs of buns and 30/10 = 3 packs of sausages.