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if you add seven consecutive integers from 0 to n then
their sum s = n(n+1)/2
We have seven consecutive integers ranging from x+0 to x+6
s = 6 * ( 6+1 ) / 2 = 21
We are also adding x seven times
so we have total = 7x+21
average = (7x+21 )/7 = x+3
Median = average if we have odd numbers
Median = average of middle two numbers if we have even numbers.
For now, don't worry about the x. Focus on "7 consecutive integers from x" part.
Since you know that median of 0 to 6 is 3 and the average is also 3, you can use this information with x included in there. All you have to do is add 3 to x. Which ultimately is the answer.