(3/4) tons of cooking oil can be exchanged for 3 tons of grain, and (7/10) tons of cooking oil can be exchanged for 1 ton of steel. How many tons of steel can be exchanged for 1 ton of grain.
(3/4)吨食油可换3吨粮食，(7/10)吨食油可换1吨钢材．1吨粮食可换多少吨钢材．
<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 / (7/10)</gadget>
<output>10/7 = around 1.428571</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) / 3</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(10/7) * (1/4)</gadget>
<output>5/14 = around 0.357143</output>

<result>5/14 = around 0.357143</result>