There are 200 students in the fourth grade in a certain school, which is 5/4 of the fifth grade, and 90% of the sixth grade. How many students are there in the sixth grade?
某校四年级有200人，是五年级人数的(5/4)，六年级人数是五年级人数的90%，六年级有多少人？
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">200 / (5/4)</gadget>
<output>160</output>

<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">160 * (9/10)</gadget>
<output>144</output>

<result>144</result>