92. A pasture is full of grass, which grows at a constant rate every day. 16 sheep can finish eating the grass in 20 days, and 20 sheep can finish eating the grass in 15 days. Now there are 12 sheep eating the grass on the pasture. After 5 days, 12 more sheep are added. It will take $\qquad$ more days to finish eating the grass on the pasture.
Reference answer: 10