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

### Instruction:
Caleb is baking a birthday cake for his grandfather. His grandfather is turning 79 years old. Caleb puts three colors of candles on the cake. He puts one candle for each year for his grandfather. He puts 27 yellow candles, 14 red candles and the rest are blue candles. How many blue candles did he use?

### Response:
 เคเลบวางเทียนสีเหลืองและแดงทั้งหมด 27 + 14 = <<27+14=41>>41 ดวง
ดังนั้น เขาใช้เทียนสีน้ำเงิน 79 - 41 = <<79-41=38>>38 ดวง