Answer: The dimensions of the gray rectangle is 1m by 12m.
Explanation:
If you find out the perimeter of the pink square, you can use the same concept to find the dimensions of the gray rectangle:
Perimeter=(L+W)*2
Substitute it: (6+7)*2=13*2=26
Now basically do trial and error: 1*12=12m
Check it: (1+12)*2=13*2=26
In conclusion, the dimensions of the gray rectangle is 1m and 12m.