In a bag of noodles, (1/5) of the total amount was used for the first time, and (3/9) of the total amount was used for the second time. At this time, the amount used is 3 kilograms more than the rest. How many kilograms are there in total in this bag of noodles? ?
一袋面，第一次用了总数的(1/5)，第二次用了总数的(3/9)，这时，用去的比剩下的多3千克，这袋面共有多少千克？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 9</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/5) - (1/3)</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">(1/3) - (7/15)</gadget>
<output>-2/15 = around -0.133333</output>

<gadget id="calculator">(1/5) + (-2/15)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">3 / (1/15)</gadget>
<output>45</output>

<result>45</result>