The fruit shop shipped back two batches of fruits, including 800 kilograms of bananas. The weight of watermelon was (4/5) that of bananas and (8/9) that of pears. How many kilograms of pears were shipped back? (solution by equation)
水果店运回二批水果，运回香蕉800千克，西瓜的重量是香蕉的(4/5)，同时又是梨的(8/9)，运回梨多少千克？(用方程解)
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">800 * (4/5)</gadget>
<output>640</output>

<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">640 / (8/9)</gadget>
<output>720</output>

<result>720</result>