To paint a wall that is 8 meters long and 4 meters wide, if every kilogram of paint can paint 4 square meters, how many kilograms of paint are needed to paint the wall?
粉刷一面长8米，宽4米的墙壁，如果每千克油漆可以粉刷4平方米，粉刷这面墙一共需要多少千克油漆．
<gadget id="calculator">4 / 4</gadget>
<output>1</output>

<gadget id="calculator">8 * 1</gadget>
<output>8</output>

<result>8</result>