There are 42 students in the third class of the sixth grade, and the ratio of boys to girls is 4:3. How many more boys than girls in this class?
六年级三班有学生42人，其中男生和女生的比是4：3，这个班男生比女生多多少人？
<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(4/7) - (3/7)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">42 * (1/7)</gadget>
<output>6</output>

<result>6</result>