The difference in the weights is 89.5kg.
Work Step by Step
Move the decimal to convert kg to g. $90kg-500g=90kg-0.5kg=89.5kg$
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.