A store bought a batch of pens at a price of 6.5 yuan each, and the price was set at 7.4 yuan. When there were 5 pens left, the profit was 44 yuan in addition to the cost. What is the number of pens in this batch?
某商店以每支6.5元的价格进了一批钢笔，售价定为7.4元，则还剩5支时，除成本外还获利44元，这批钢笔的支数是多少
<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>