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

### Instruction:
Lidia bought a new tablet, and she needs to buy some apps for it. One app costs $4 on average, and Lidia needs 15 of them. She has $66 for this purpose. How much money will she be left with if she buys all the apps she needs?

### Response:
 ดังนั้นลิเดียจะใช้เงิน 4 x 15 = $<<4*15=60>>60 บาทสำหรับแอป
เธอมีเงินอยู่แล้ว $66 ดังนั้นเธอจะเหลือเงิน 66 - 60 = $<<66-60=6>>6.