The store bought a batch of sandals at a price of 6.5 yuan per pair, and the price was 7.4 yuan. When there are 5 pairs of sandals left, the profit is 44 yuan in addition to the cost. How many pairs of this batch of sandals are there?
商店以每双6.5元的价格购进一批凉鞋，售价为7.4元．卖到还剩5双时，除成本外还获利44元，这批凉鞋共有多少双？
<gadget id="calculator">7.4 * 5</gadget>
<output>37</output>

<gadget id="calculator">44 + 37</gadget>
<output>81</output>

<gadget id="calculator">7.4 - 6.5</gadget>
<output>0.9</output>

<gadget id="calculator">81 / 0.9</gadget>
<output>90</output>

<result>90</result>