The fruit shop shipped a batch of apples and bananas. It is known that their ratio is 4:5, and 320 kg of apples were shipped. How many kilograms is this batch of fruit in total?
水果店运来一批苹果和香蕉，已知它们的比是4：5，苹果运来320千克．这批水果共有多少千克？
<gadget id="calculator">320 / 4</gadget>
<output>80</output>

<gadget id="calculator">80 * 5</gadget>
<output>400</output>

<gadget id="calculator">320 + 400</gadget>
<output>720</output>

<result>720</result>