A number minus its (3/5) is exactly 60% of (4/9). What is this number? (solution by equation)
一个数减去它的(3/5)，正好是(4/9)的60%，这个数是多少？(用方程解)
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(4/9) * (3/5)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">(3/5) + (4/15)</gadget>
<output>13/15 = around 0.866667</output>

<result>13/15 = around 0.866667</result>