The fruit wholesale store shipped 150 boxes of apples and pears, of which the number of boxes of apples accounted for 60%. Due to the large sales volume of apples, some more apples were shipped in. At this time, the number of boxes of apples accounted for 70% of the total. How many boxes of apples were shipped in?
水果批发店运来苹果和梨共150箱，其中苹果的箱数占60%，由于苹果的销售量较大，所以又运进了一些苹果，这时苹果的箱数占总数的70%，求又运进了多少箱苹果？
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">150 * (7/10)</gadget>
<output>105</output>

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

<gadget id="calculator">150 * (3/5)</gadget>
<output>90</output>

<gadget id="calculator">105 - 90</gadget>
<output>15</output>

<gadget id="calculator">1 - (7/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">15 / (3/10)</gadget>
<output>50</output>

<result>50</result>