RT-Mart Supermarket originally had some flour, 5 kilograms per bag, and after selling 7 bags, there were 40 kilograms left. How many kilograms of flour did the store originally have?
大润发超市原来有一些面粉，每袋5千克，卖出7袋以后，还剩40千克．这个商店原来有多少千克面粉？
<gadget id="calculator">5 * 7</gadget>
<output>35</output>

<gadget id="calculator">35 + 40</gadget>
<output>75</output>

<result>75</result>