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

### Instruction:
Meryll wants to write 35 multiple-choice questions and 15 problem-solving questions for her Chemistry class. She already has written 2/5 of the multiple-choice and 1/3 of the problem-solving questions. How many more questions does she need to write for both multiple-choice and problem-solving?

### Response:
 ปรนัย: 35 ข้อ x 2/5 = 14 ข้อ
แก้ปัญหา: 15 ข้อ x 1/3 = 5 ข้อ
เขียนแล้ว: 14 ข้อ + 5 ข้อ = <<14+5=19>>19 ข้อ
35 ข้อ + 15 ข้อ = <<35+15=50>>50 ข้อ
เมริลต้องเขียนคำถามเพิ่มอีก 50 ข้อ - 19 ข้อ = <<50-19=31>>31 ข้อ