The canteen brings in some rice, eats 30 kilograms a day, eats for 5 days, and there are 20 kilograms left, how many kilograms of rice are brought into the canteen?
食堂运进一些大米，每天吃30千克，吃了5天，还剩20千克，食堂运进多少千克大米？
<gadget id="calculator">30 * 5</gadget>
<output>150</output>

<gadget id="calculator">150 + 20</gadget>
<output>170</output>

<result>170</result>