Dad's weight this year is 72 kg, which is 18 kg less than Xiaoqiang's three times. How many kilograms does Xiaoqiang weigh this year?
爸爸今年的体重是72千克，比小强体重的3倍少18千克．小强今年的体重是多少千克？
<gadget id="calculator">72 + 18</gadget>
<output>90</output>

<gadget id="calculator">90 / 3</gadget>
<output>30</output>

<result>30</result>