The sum of (1/4) and 40% of a number is 1300, what is this number?
一个数的(1/4)与它的40%的和是1300，这个数是多少？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/4) + (2/5)</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">1_300 / (13/20)</gadget>
<output>2_000</output>

<result>2_000</result>