In a certain class, 45 students have reached the physical exercise standard, and 5 students have not reached the standard. Find the standard rate.
某班学生中已有45人达到了体育锻炼标准，还有5人没有达标，求达标率．
<gadget id="calculator">45 + 5</gadget>
<output>50</output>

<gadget id="calculator">45 / 50</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(9/10) * 1</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>