The length of a large rectangular room is 7 metres more than its width. If the perimeter is 34 metres, the length of the room, in metres, is:
+1252 Answer: 12 (metres)
Explanation:
Let the length be a. Then the width is a-7.
Now, the perimeter is 2(a-7)+2(a)=4a-14, which is 34.
a=12 meters.
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