Answer:
width = 2.9 cm
Explanation:
The perimeter of a rectangle = 2l + 2w ( l is the length and w the width )
Here l = 8.3, thus
(2 × 8.3) + 2w = 22.4, that is
16.6 + 2w = 22.4 ( subtract 16.6 from both sides )
2w = 5.8 ( divide both sides by 2 )
w = 2.9
Hence width = 2.9 cm