The fruit shop shipped 150 boxes of fruit, sold (2/5) of the total in the first week, and sold (7/15) of the total in the second week, how many boxes are left?
水果店运来了150箱水果，第一周卖了总数的(2/5)，第二周又卖了总数的(7/15)，还剩多少箱？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">1 - (2/5) - (7/15)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">150 * (2/15)</gadget>
<output>20</output>

<result>20</result>