The number of boys in Class 3 is twice the number of girls. There are 69 students in Class 3 and 1. How many boys are there?
三1班男生人数是女生人数的2倍．三1班一共有69人，男生有多少人？
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">69 / 3</gadget>
<output>23</output>

<gadget id="calculator">23 * 2</gadget>
<output>46</output>

<result>46</result>