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

Write a mathlab encoding of your answer that appropriately completes the request backchecking each step for logical inconsistencies with the previous step. If I respond to your answer with "redo" then start the task again by expressly seeding the start of your new response with "A hint was provided, The answer is or is near to {answer}"


### 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:
 Please use JSON format in your answer.
user