Sunshine Supermarket donated 6 boxes of ham, 4500g each, to the disaster area in Wenchuan, and then donated some more. At this time, it donated a total of 36kg. How many boxes were donated later? (column equation solution)
阳光超市为汶川灾区捐献6箱火腿，每箱4500g，之后又捐了一些，这时共捐了36kg，后来又捐了几箱？(列方程解答)
<gadget id="calculator">4_500 * 6</gadget>
<output>27_000</output>

<gadget id="calculator">36_000 - 27_000</gadget>
<output>9_000</output>

<gadget id="calculator">9_000 / 4_500</gadget>
<output>2</output>

<result>2</result>