Dad's weight is 78 kg, which is 3 kg more than 2.5 times Xiao Ming's weight. How many kilograms does Xiao Ming weigh? (solution by equation)
爸爸的体重是78千克，比小明体重的2.5倍还多3千克．小明的体重是多少千克？(用方程解)
<gadget id="calculator">78 - 3</gadget>
<output>75</output>

<gadget id="calculator">75 / 2.5</gadget>
<output>30</output>

<result>30</result>