There are 15 more boys than girls in a certain grade. There are as many girls (1/3) as boys (2/7). How many people are there in this grade?
某年级男生比女生多15人．女生的(1/3)与男生的(2/7)一样多，该年级一共有多少人？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(2/7) / (1/3)</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">1 - (6/7)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">15 / (1/7)</gadget>
<output>105</output>

<gadget id="calculator">105 - 15</gadget>
<output>90</output>

<gadget id="calculator">105 + 90</gadget>
<output>195</output>

<result>195</result>