20% of a number is 2 more than 40% of 70. Find this number.
一个数的20%比70的40%多2，求这个数．
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">70 * (2/5)</gadget>
<output>28</output>

<gadget id="calculator">28 + 2</gadget>
<output>30</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">30 / (1/5)</gadget>
<output>150</output>

<result>150</result>