Xinmin Food Factory produced (7/2) tons less milk biscuits than fruit juice biscuits in September, and the tonnage of milk biscuits was (5/6) that of fruit juice biscuits. How many tons were produced of milk biscuits?
新民食品厂九月份生产的牛奶饼干比果汁饼干少(7/2)吨，牛奶饼干的吨数是果汁饼干的(5/6)，牛奶饼干生产了多少吨．
<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 - (5/6)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(7/2) / (1/6)</gadget>
<output>21</output>

<gadget id="calculator">21 * (5/6)</gadget>
<output>35/2 = around 17.5</output>

<result>35/2 = around 17.5</result>