There were 11 boys and 18 girls in the Art Interest Group of Love Primary School. After a few boys are transferred, the ratio of male to female students is 5:6. How many boys are transferred?
爱心小学美术兴趣小组原来有男生11人，女生18人．有转来几名男生后，男女学生人数比是5：6，转来男生多少人？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">18 * (5/6)</gadget>
<output>15</output>

<gadget id="calculator">15 - 11</gadget>
<output>4</output>

<result>4</result>