Uncle Wang stocked 320 breams in the fish pond, 80 breams were 4 times less than crucian carp. How many crucian carp are stocked? (solution by equation)
王叔叔在鱼池里放养鳊鱼320尾，放养的鳊鱼比鲫鱼的4倍少80尾．放养鲫鱼多少尾？(用方程解)
<gadget id="calculator">320 + 80</gadget>
<output>400</output>

<gadget id="calculator">400 / 4</gadget>
<output>100</output>

<result>100</result>