Xiaojun has more stamps than Xiaohai (1/3), and Xiaohai has more stamps than Xiaoming (6/7). It is known that Xiaojun has 30 more stamps than Xiaohai, how many stamps does Xiaoming have.
小军的邮票张数比小海多(1/3)，小海的邮票张数是小明的(6/7)．已知小军比小海多30张邮票，小明有多少张邮票．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">30 / (1/3) / (6/7)</gadget>
<output>105</output>

<result>105</result>