Below is an instruction that describes a task. Write a response that appropriately completes the request in Thai. Please answer in Thai.

### Instruction:
Tanya went to the grocery store to buy some fruit.  She bought 6 pears, 4 Granny Smith apples, 2 pineapples, and a small basket of plums, which were all placed in a single paper bag.  Unfortunately, the bag that the fruit had been placed in had developed a hole.  Therefore, as Tanya walked home, half of the fruit fell out of the bag.  When she later counted the fruit left in the bag, there were only 9 pieces remaining.  How many plums did she buy?

### Response:
 ถ้าครึ่งหนึ่งของผลไม้เท่ากับ 9 ชิ้น แสดงว่าทัญญาซื้อผลไม้ทั้งหมด 2*9=<<2*9=18>>18 ชิ้น
ดังนั้น ทัญญาซื้อพลัม 6 ลูก