Let width = W. Then length L = 2W + 5.<br><br>
[[model:questions/solutions/q6973.png]]<br><br>
Perimeter = 2(L + W) = 2(2W + 5 + W) = 2(3W + 5) = 6W + 10 = 58<br>
&bull; 6W = 58 − 10 = 48<br>
&bull; W = 48 ÷ 6 = 8<br><br>
The width of the garden is 8 m.<br>
Check: L = 2(8) + 5 = 21, Perimeter = 2(21 + 8) = 2 x 29 = 58. ✓<br><br>
Final Answer: 8 m