Question 28
Rabbit Vasya loves cabbages and carrots. In a day, he eats either 9 carrots, or 2 cabbages, or 1 cabbage and 4 carrots. But some days he only eats grass. Over the last 10 days, Vasya ate a total of 30 carrots and 9 cabbages. On how many of these 10 days did he eat only grass?