The first scheme:
The pony passes 5 10 kg first,
Then bear, pig and calf live together.
160+400+240 = 800kg
The second plan:
Pony and bear pass 5 10+ 160=670 kg first.
Then pigs and calves live together.
400+240=640 kg
The third scheme:
Pony and pig pass first, 5 10+400=9 10 kg,
Then the bear and the calf live together.
160+240 = 400kg
The fourth scheme:
Pony, bear and calf pass first, 510+160+240 = 910 kg.
Then the pig weighed 400 Jin.
The fifth, sixth, seventh and eighth schemes are to change the order of the first four schemes.
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