A batch of pears, apples, and bananas are shipped from the fruit shop. Apples are 40 kg more than bananas. The mass ratio of pears, apples, and bananas is 3:7:5. How many kg are the pears shipped?
水果店运来一批梨、苹果、香蕉，其中苹果比香蕉多40千克，梨、苹果和香蕉的质量比是3：7：5，运来的梨有多少千克？
<gadget id="calculator">3 + 7 + 5</gadget>
<output>15</output>

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

<gadget id="calculator">5 / 15</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">40 / (2/15)</gadget>
<output>300</output>

<gadget id="calculator">3 / 15</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">300 * (1/5)</gadget>
<output>60</output>

<result>60</result>