△△▲▲△▲△△▲▲△▲△△…Arrange 60 triangles according to this arrangement, how many white ones are there?
△△▲▲△▲△△▲▲△▲△△…按这个排法摆60个三角形，有多少个白色的．
<gadget id="calculator">60 / 6</gadget>
<output>10</output>

<gadget id="calculator">10 * 3</gadget>
<output>30</output>

<result>30</result>