The sixth grade has four classes, A, B, C, and D. Class A is not counted. The rest of the class has 131 students. Class D is not counted. 4/5), how many people are there in the sixth grade?
六年级有甲乙丙丁四个班，不算甲班，其余班共131人，不算丁班，其余班共135人，又知甲丁两班人数之和是乙丙两班人数之和的(4/5)，六年级共有多少人．
<gadget id="calculator">266 - 95</gadget>
<output>171</output>

<result>171</result>