There are 150 tons of stones in the quarry, (2/5) of the total number is transported in the first time, and the rest (3/4) is transported away in the second time, how many tons are transported in the second time?
采石场有石头150吨，第一次运走总数的(2/5)，第二次运走剩余的(3/4)，第二次运走多少吨？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">150 * (2/5)</gadget>
<output>60</output>

<gadget id="calculator">150 - 60</gadget>
<output>90</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">90 * (3/4)</gadget>
<output>135/2 = around 67.5</output>

<result>135/2 = around 67.5</result>