I found the highest multiple of three that was under 100 which was 99 and then I added one onto that as there is always 1 left. This made 100. Then I did this for the rest of the multiples of 3. I did this for 4 rows which was 96 so I added one onto that and I had 97. Then I did it for 5 and 6 rows and when I had done this I noticed that 61 garlic cloves was on the list for 3,4,5 and 6. This is how I found out that Ben has 61 garlic cloves.
With 3 rows you can have:
100 garlics
97 garlics
94 garlics
91 garlics
88 garlics
85 garlics
82 garlics
79 garlics
76 garlics
73 garlics
70 garlics
67 garlics
64 garlics
61 garlics
With 4 rows he can have:
97 garlics
93 garlics
89 garlics
85 garlics
81 garlics
77 garlics
73 garlics
69 garlics
65 garlics
61 garlics
With 5 rows he can have:
96 garlics
91 garlics
86 garlics
81 garlics
76 garlics
71 garlics
66 garlics
61 garlics
With 6 rows he can have:
97 garlics
91 garlics
85 garlics
79 garlics
73 garlics
67 garlics
61 garlics
Ben has 61 garlic cloves altogether.