The fruit shop shipped 120 boxes of pears, each weighing 45 kg. After selling some, there are 70 boxes left, how many kilograms are sold? (answer in two ways)
水果店运来120箱梨，每箱重45千克．卖出一些后还剩70箱，卖出多少千克？(用两种方法解答)
<gadget id="calculator">45 * 120</gadget>
<output>5_400</output>

<gadget id="calculator">45 * 70</gadget>
<output>3_150</output>

<gadget id="calculator">5_400 - 3_150</gadget>
<output>2_250</output>

<result>2_250</result>