The wrong step is step 4, because you only need one conversion.
The formula to convers pounds to kilograms is
[tex] \text{weight in pounds} = 2.2 \times \text{weight in kilograms} [/tex]
Obviously, the inverse formula is
[tex] \text{weight in kilograms} = \cfrac{\text{weight in pounds}}{2.2} [/tex]
So, you're given an input of 142 pounds. To convert it in kilograms, plug that value into out formula:
[tex] \text{weight in kilograms} = \cfrac{142}{2.2} \approx 64.5 [/tex]
and this is the answer you're looking for, so you need no more steps.
