wholesaler of breakfast milk sent a batch of breakfast milk to the school. The first batch of milk was shipped away (7/13), and 45 boxes were shipped away for the second time. There are still 15 boxes left. How many boxes of this batch of breakfast milk are there?
某早餐奶批发店给学校送一批早餐奶，第一次运走这批奶的(7/13)，第二次运走45箱，还剩下15箱，这批早餐奶共有多少箱．
<gadget id="calculator">45 + 15</gadget>
<output>60</output>

<gadget id="calculator">7 / 13</gadget>
<output>7/13 = around 0.538462</output>

<gadget id="calculator">1 - (7/13)</gadget>
<output>6/13 = around 0.461538</output>

<gadget id="calculator">60 / (6/13)</gadget>
<output>130</output>

<result>130</result>