Assuming that each cow eats X Jin of grass every day, then each sheep eats (136-8x)/3 Jin of grass every day.

The countable equation: 3x+[8136-8x]/3 =106 can be solved as x= 14kg, and each sheep eats grass every day (136-8 *14)/3 = 8.

2

If each volleyball is X yuan, then each football is (155-6x) yuan.

Column equation:13x+3 (155-6x) = 365. X=20 yuan for each volleyball and x = 155-6*20=35 yuan for each football.