A bag of rice, 7kg is used, and there is (3/4) left. How many kilograms does this bag of rice weigh? (solution with equation)
一袋大米，用去7kg，还剩(3/4)．这袋大米有多少千克？(用方程解答)
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">7 / (1/4)</gadget>
<output>28</output>

<result>28</result>