For a rectangle, if its length increases (1/3) and its width increases (1/4), how much does the area of the new rectangle increase compared to the original
一个长方形，如果它的长增加(1/3)，宽增加(1/4)，那么新的长方形的面积比原来增加多少
<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">4 / 1</gadget>
<output>4</output>

<gadget id="calculator">1 + 4</gadget>
<output>5</output>

<gadget id="calculator">5 / 3</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">(5/3) - 1</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>