What is the average of integers $a$, $b$ and $c$ if the average of the two numbers $a$ and $2b$ is 7 and the average of the two numbers $a$ and $2c$ is 8?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
What is the average of integers $a$, $b$ and $c$ if the average of the two numbers $a$ and $2b$ is 7 and the average of the two numbers $a$ and $2c$ is 8?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
5
What is the average of integers $a$, $b$ and $c$ if the average of the two numbers $a$ and $2b$ is 7 and the average of the two numbers $a$ and $2c$ is 8?
train