The average height of the whole class is 138 cm. There are more boys than girls (1/5), and the average height of girls is taller than boys (1/10). What is the average height of boys in this class?
全班平均身高为138厘米，其中男生比女生多(1/5)，女生平均身高比男生高(1/10)，这个班男生平均身高是多少厘米？
<gadget id="calculator">138 * 6</gadget>
<output>828</output>

<gadget id="calculator">138 * 5</gadget>
<output>690</output>

<gadget id="calculator">828 + 690</gadget>
<output>1_518</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) * 5</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">6 + 5 + (1/2)</gadget>
<output>23/2 = around 11.5</output>

<gadget id="calculator">1_518 / (23/2)</gadget>
<output>132</output>

<result>132</result>