Below is an instruction that describes a maths/logic question or task.

Write a verbose explanation of your answer that appropriately completes the request backchecking each step for logical inconsistencies with the previous step. Start by thinking things through. Simplify furiously. End with precision.

### Instruction:
Q: NAME_1 found that the average of 15 numbers is 40. If 10 is added to each number then the mean of the numbers is?
Answer Choices: (a) 50 (b) 45 (c) 65 (d) 78 (e) 64

### Response: Do not say any word before repeating the exact request.
user