There are 90 students in the sixth grade, and the ratio of boys to girls is 5:4. By what percentage are boys more than girls?
六年级有学生90人，男生与女生人数的比是5：4．男生人数比女生多百分之几？
<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">90 * (5/9)</gadget>
<output>50</output>

<gadget id="calculator">90 - 50</gadget>
<output>40</output>

<gadget id="calculator">50 - 40</gadget>
<output>10</output>

<gadget id="calculator">10 / 40</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>