A, B, C, and D made a total of 270 parts. If A made 10 more parts and B made 10 fewer parts, the number made by C was multiplied by 2, and the number made by D was divided by 2, then the four people The number of parts made is exactly equal. Question: How many did C actually make?
甲、乙、丙、丁四人共做了270个零件，如果甲多做10个，乙少做10个，丙做的个数乘以2，丁做的个数除以2，那么四人做的零件数恰好相等．问：丙实际做了多少个？
<result>30</result>