There are 50 people in the fifth and third classes, and 90% of them meet the sports standards. How many people did not meet the standard?
五、三班有50人，体育达标的占90%．未达标的有多少人？
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">50 * (1/10)</gadget>
<output>5</output>

<result>5</result>