9.42 is the circumference, for future refernce its just pi times diameter :)
Name the first even integer you are looking for

. The next even number is

.
Their sum is

, so

. That means

, hence

.
So, the desired numbers are

and

.
1 kilogram = 1000 grams, so the mass of Jack's bicycle is 9000 grams.
Thanks for your question! Please choose my answer as the brainliest so that I can help you with all of your questions! Thanks!