(2/5) of a number is 0.3 less than (1/4) of 2.8, find this number.
一个数的(2/5)比2.8的(1/4)少0.3，求这个数．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2.8 * (1/4)</gadget>
<output>0.7</output>

<gadget id="calculator">0.7 - 0.3</gadget>
<output>0.4</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">0.4 / (2/5)</gadget>
<output>1</output>

<result>1</result>