A rectangular wall, 8 meters long and 3.5 meters high. It took 7 kilograms of paint to paint this wall, how many kilograms of paint is used on average per square meter?
一个长方形墙面，长8米，高3.5米．粉刷这面墙用了7千克涂料，平均每平方米用涂料多少千克？
<gadget id="calculator">8 * 3.5</gadget>
<output>28</output>

<gadget id="calculator">7 / 28</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>