Xiao Ming and Xiao Hong each have 30 stamps on average. It is known that the ratio of the number of stamps between Xiao Ming and Xiao Hong is 2:3, how many stamps does Xiao Ming have.
小明和小红平均每人有30张邮票人，已知小明和小红邮票的张数比是2：3，小明有邮票多少张．
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">30 * 2 * (2/5)</gadget>
<output>24</output>

<result>24</result>